Sleeping capsule is super clean. They provide house slippers but the floor areas are mixed for outside shoes as well. That defeats the purpose. People wearing shoes and slippers into the elevators, locker room, and shower/sink room, and toilet rooms, sleeping capsule room & lounge. So what's the point? Many hostels in Japan has a shoe rack at the front lobby or entrance.
Carpets are used throughout the hostel. They should remove the carpets in the shower area and most important, the toilet rooms. There is a urine smell in every one of them. Can't get rid of urine soak carpet smell. Carpet also holds onto humidity, promotes mold.
The elevator is very slow. I constantly have to go between sleeping floor, shower\locker floor, & lounge floor. Only 2 toilet rooms on my floor with 26 sleeping pods. If by chance both are occupied, I cannot run to the next floor via the stairs. It's security locked. It looks to be able to be broken thru in case of a fire evacuation. But, they don't want you to use it. SO, if you for what ever reason that you may have a need for urgent access ... old, drunk, medical issues, etc. something to think about.