Place is what you'd expect from the price.
Be advised you have to go up some stairs to reach the hostel itself (3F).
It's closest to Okubo station, but with maybe 5 more minutes walking you can get to a Yamanote Line station (Shin-Okubo). It's also within reasonable (15 mins depending on the person) walking distance to Shinjuku station.
There are "combinis" and a couple of small markets where you can buy stuff for cheaper near it, namely My basket and Gyomu.
Inside there are shared shower rooms (2 in the same room), 2 toilets , and a women exclusive shower room and toilet near the entrance.
The room itself is small but with enough room to fit a large bag without too much hassle.
The air conditioner inside was a little busted but worked fine, though it wasn't hot so I didn't use it for much beyond ventilation. The window in the room didn't shut all the way. It was enough to dimish the noise from outside, though.
They provided a towel and hair dryer in the room and there are some other ammenities in the shared shower rooms area.
There is a refrigerator in the common area available, though I didn't use it.
Overall a nice place for short stays on a budget, but the experience can vary wildly based on the other guests, since the walls are so thin you can hear anything everyone is doing even from 1-2 rooms away.