They host cooking classes on the only public space
There is only a little kitchen on the first floor as a public space. This kitchen is the only place where you can sit as the bedrooms are tiny. The worse part of it is that hostel rent this kitchen to outsiders for cooking classes(!). During my stay, there were two times when the kitchen wasn't available from 10 AM to 4 PM! At one time it was a stormy day. It was a radically uncomfortable experience I would suggest staying instead in one of the capsule hotels which you can find also close to Roppongi.