Wow, I was worried because there weren't many reviews, but one Korean person gave it 5 stars without a word, so I booked it right away.
The location was a bit hard to find. If you look at the ice cream shop that Koreans call "Egypt Yoa Jeong" on Google Maps and turn left, you'll find the entrance. Go inside, turn right, and you'll find the elevator. If you don't close the elevator door properly or bang your suitcase against it, a warning sound goes off, and it's super loud, so be careful!
Anyway, it's on the 6th floor. When you go up, the staff kindly guide you! They even let me take a shower ㅠㅠ I used the restroom a lot too (it wasn't intentional...). I was prepared to pay, but it was free ㅠㅠ Thank you. The water pressure was great, and I even repacked my luggage here... I came here because the luggage storage at that place with tons of reviews and the famous ones was full, and it's just so, so, so, so good!
When something is really good, I write a very detailed review, you know? It really is great.
Koreans, go here!