Gilpost · Seongdong-gu, Seongsu-dong 2-ga
Cafe
io3
아이오쓰리 에이스하이엔드점 Aiosseuri Eiseuhaiendeujeom
Compiled from 10 blog posts read in fullSources →
A café on the ground floor (unit 103) of the Ace High-End Seongsu Tower, under ten minutes' walk from Seongsu Station exit 3. You order coffee, sandwiches and hot dogs at a kiosk, and there is a photo booth inside. The space is often rented out for idol and character birthday cafés, so of the 30 posts we read (18 Nov 2025 to 2 Oct 2026), seven of the eleven actual visits were during the Duolingo birthday café of 26–28 June 2026 and one during a RIIZE Shotaro birthday café in November 2025. Only three describe an ordinary day. Of the other 19, we set aside 12 as other shops in the same building or other venues of the touring event, and did not count 7 announcement or listing posts.
Data as of · Published ·
Location & hours
- Address서울특별시 성동구 성수이로10길 14, 1층 103호 (성수동2가)14 Seongsui-ro 10-gil, Seongdong-gu, Seoul
- Typical spend₩4,000 – ₩5,300
- From the station3 posts say it is walkable from the station.
- Floor areaFloor area 86 m² · Status In business
What sets it apart
- During events the wait is long. Seven posts from the Duolingo birthday café describe waiting: 100 teams ahead at 11:35 and about 85 minutes; about 50 minutes after arriving at 11:10; just over an hour after arriving at 11:45; registered at 12:02 with a number in the 250s and got in around 1:45. There was no physical line — you registered on a tablet out front and were called by KakaoTalk, with 15 minutes to show up. On an ordinary weekday morning in November 2025, one visitor found the place empty.
- The waiting area is the benches outside; three posts mention sitting there while waiting.
- Six posts mention the photo booth. One of the two ordinary-day visitors notes props such as headbands; the four who went during the Duolingo event say you could only use it by winning a ticket in the lucky draw — one asked to pay instead and was refused.
- Three visitors came on foot from Seongsu Station — under ten minutes from exit 3 — one of them by public transport all the way from Dongtan.
What 10 bloggers said
deochi keopi
Returning customer
We read all 10 in full. The most common claims are “Had to wait” (7) and “Returning customer” (2).
What they liked
What they struggled with
Where they disagree
| Roomy | yes 3 · no 3 |
|---|
Things you can check on site
- Photo booth 6 of 10 posts
- Reachable by transit 3 of 10 posts
- Waiting area 3 of 10 posts
- Self-order screen 2 of 10 posts
- Takeout 2 of 10 posts
- Coffee served 2 of 10 posts
- Seasonal decorations 1 of 10 posts
- Large windows 1 of 10 posts
- High ceiling 1 of 10 posts
These are raw counts, not percentages. Someone who did not mention something is not someone who disagreed.
Parking
1 posts say you can park. None say you cannot.
| Posts saying you can park | 1 of 10 posts |
|---|
Only one visitor (December 2025, self-paid) wrote about parking here: an hour free with a purchase of 12,000 won or more. A listing post repeats the same line. Another driver parked at a different lot nearby.
Who came, and with whom
- Family visit 2 of 10 posts
- Came with children 1 of 10 posts
- With a friend 1 of 10 posts
- Came by car 1 of 10 posts
Where it is
We could not find this shop’s own listing on Naver Map, so the link searches for its Korean name around this spot instead.
From the station
Three visitors came on foot from Seongsu Station — under ten minutes from exit 3 — one of them by public transport all the way from Dongtan.
Getting inside
No visitor wrote about the floor or the entrance; the address says ground floor, unit 103, but nobody described the way in.
Nobody mentioned a step at the door or coming in with a wheelchair or stroller — that means unknown, not absent.
No post says where the toilet is or whether it is separated by gender.
No one mentioned: Second floor · In a basement · Lift to the floor · Ramp at the door · Step at the entrance · Step-free access · Toilet inside · Accessible toilet · Separate restrooms. That is not the same as there being none — it means we could not confirm it. Worth calling ahead, and do tell us: we will put it here.
How to read these posts
- Posts saying they paid themselves1 of 10 posts
- Posts saying nothing either way9 of 10 posts
Posts that followed a TV spot
Of the 17 posts we gathered, 7 went up on a single day right after a TV spot and show no sign of a visit. They retell the broadcast, so we left them out of the counts.
| 2026-06-27 | 2 posts in one day |
|---|
We do not discard them. That a TV spot produced a burst of posts is itself something worth knowing about a place, and a star rating will not show it.
When the posts appeared
Month by month
| Month | Posts |
|---|---|
| 2025-11 | 1 |
| 2025-12 | 1 |
| 2026-04 | 1 |
| 2026-06 | 5 |
| 2026-07 | 2 |
What we do not know
- Opinions split 3–3 on size. Among event visitors, two found it clearly roomier than the earlier venues and three called it small or a bit cramped; one ordinary-day visitor called it spacious and airy.
- Company is too thin to say much: two posts went with family (a child, a mother), one with a friend, one by car. No visitor wrote about going alone or on a date.
- No post gives the café's regular opening hours. The Fri 11:00–18:30 / Sat–Sun 11:00–19:30 times quoted in many posts were for the three-day Duolingo event only. One visitor notes the space looks different every time because of birthday-café rentals.
- Prices are scarce. The menu prices (Americano 4,000, café latte 5,000, vanilla latte 5,300, cold brew 4,700 won) come from a single April 2026 listing post, not a visit. The only price a visitor recorded is 13,000 won for two drinks during the event, so we can't say what a meal costs.
- No post lists a phone number, and no visitor explains how to book or enquire about renting the space.
- We did not count two boilerplate promotional posts with no first-hand detail, nor one post that names a different café as the event venue. The claim that it is 'famous as a celebrity café' is hearsay and not used.
Sources (10)
Every number above was counted from the posts below.
- 듀오링고 생일 카페 성수 | 아이오쓰리 에이스하이엔드점 | 굿즈 특.... 2026-07-10 · 먹고 걷고 적고
- 홍대/성수 듀오링고 생일카페 웨이팅 방문 후기 : 아이오쓰리 에이.... 2026-07-01 · 메몽의 슬기로운 유부생활
- [26.06.28] 성수 나들이 코스 추천! 초등 아이와 팝업 투어 2026-06-28 · 행복한 우리집 · via Daum
- 듀오링고 마지막 생일카페 :: 성수 아이오쓰리 에이스하이엔드점 2026-06-27 · 기튀뻥의 특별한 일상
- 듀오링고의 마지막 생카에요! 성수 <듀오링고 생일카페> 정보 및 후기: 웨이팅 시간, 특전, 이벤트 등 2026-06-27 · 서울 캐릭터 팝업 및 이벤트 모음Zip · via Daum
- 듀오링고 성수 생일카페 후기 정보 2026-06-26 · 렛츠고 끼호~
- 듀오링고 생일카페 💚 | 성수 1일차 후기 2026-06-26 · ! · via Daum
- 일상 끄적끄적 2026-04-23 · ლ( ╹ ◡ ╹ ლ)
- [성수카페추천] 주차가능 카페 아이오쓰리 2025-12-26 · 오래토록 남을 일상기록✨
- 성수까페 아이오쓰리(io3) 2025-11-18 · 김워킹맘 · via Daum
Of 368 candidate posts we opened 72 and kept 10 as evidence. We stop once 30 are confirmed: beyond that the counts grow in proportion without changing the answer.