I grouped up with two other mates to stay here for roughly a week.
The place is generally quite clean, but we ran into a few issues.
The washing / drying machine doesn't function properly. In fact, it doesn't even dry. Had my clothes roll around in there for over 10 hours, still completely soaked. The pricing is relatively cheap, but the reasoning behind that is the location. Over a 10 minute walk to the nearest station, which you can then transfer a few stations over to Shinjuku, which takes anywhere from 15-20 minutes overall.
Also, the only mirror is in the shower room with a lil' sinky.
So if you plan on brushing your teeth you gotta bust out the flippers.
It's more of a local area, as if you were living in Tokyo for awhile, doesn't have the greatest surroundings or atmosphere.
Great for a casual thing to chill with friends, but if you're in Shinjuku for its nightlife I would recommend elsewhere.