Kozayo is a hostel located above their cafe of the same name. Despite being RIGHT next to the hot party area of the legendary Hongdae district, the rooms were exceptionally quiet besides the occasional shuffling of my roommates. Be forewarned that there is a security deposit for the capsule remote (at the time 100K won).
There is a small towel provided, roughly about 5~6 shower stalls per floor, and 4 toilets if i remember right. The bathroom with a toilet is a bit small, so if you're very tall or wide you may find it a bit awkward to scooch in.
These are minor nitpicks however and if youre looking to be right next to the party action i can think of few better options. No major complaints.