Over the course of my trip to Japan, I stayed in five hotels. This last hotel was the worst of the set.
The location is unsafe and quite loud in the evenings, which I am really disappointed I missed when booking. It's a redlight district in Shinjuku, so beware if you're bringing family. I am not a partier, and this was the absolute wrong hotel and neighbourhood for me, in light of this.
The room was dusty and dirty, with pieces of lint and other debris scattered in the room.
The beds are deeply uncomfortable - hard as a rock, to the point that you get back and hip pain easily. Both my partner and I slept terribly - the hotel would do well to invest in new mattresses.
Consider going elsewhere if you're looking for a good rest and clean room.