I had stayed here for a month.
The size of the place was ok-ish for a man but might be small for people like me. (I'm 185cm and a bit buff)
Location-wise, surroundings are bland and Shinagawa station is around 17~ 20 min walk. (Rinkai line is a 8 min walk, but the line itself doesn't run to the centric area of Tokyo)
It gets extremely cold in the night, and the floor is freezing so you won't be able to walk around without sleepers.
The tenants upstairs are kinda noisy, you can hear their child running around at times.
Don't expect any scenery outside the
Window. There is a wall facing you, and I kinda felt sick cause there was no light coming into the room.
Overall, I would say I won't pick this again for my next visit to Japan, but if you are urgent, you can consider this one as the last resort.