If you go in with the expectations that this hostel doesn't have a ceiling between rooms, and that there are a lot of restrictions about what you can do in your room, then it's a good place for a short stay. The room and bathroom were very clean. I shared a private twin with my friend. We both wished there was a small or shelf in the room to organize more easily. The common area and shared bathroom was very nice and clean. I would stay again if transferring through Kumamoto for a night.
This is a capsule hostel so the rooms arent very big all the rooms dont actully have roofs and the walls are paper thin so if u have a snorer next door u may not be able to get to sleep they do offer earplugs and free toothbrushes so so that a bonus