You can expect an inhumane room that is extremely small. only enough space for 2 mattresses, which are very thin and will make sure you can feel the chill right from the floor. There is no curtain at all, guarantee you waking up together with the sunrise. there is not even a hook to hang the clothes and you gonna take a shower on toilet bowl, coz the washroom is that small.
If you want to stay here, I would recommend you to sleep in metro station toilet, at least it has hooks for clothes and heated toilet bowl rim.
If you want to have a taste of life in a jail cell, 8000 yen for this room is maybe not bad price :)
There is a hotel down the road which only costs you 5000 yen for a room, even nearer to the station.