The price of this place is very good for the location, and the hosts were very responsive. A few downsides, one being that there was a noticeable number of tiny fruit flies or gnats, and they kept accumulating in the bottom of the shower and on the floor, which wasn't so pleasant. The stove also didn't work. The futon is very thin, and the towels felt very old. Also, make sure you do bring the right form of identification -- I thought since there was a process of sending passport information and photos online, that I would not need to bring it in person. But not having it caused a lot of issues for me when I had to check in. They were nice enough to figure out an alternative, which I appreciated since I was checking in late at 10pm, but I wish they had been more explicit about the need to bring the right form of ID since you can't get in otherwise (I had my foreign drivers license but that is not allowed).
Other than that, the location is really good and quiet even though it's walking distance to Shinjuku, and if you're looking for a decent and safe place to stay in that neighborhood on a tight budget, I guess I would still recommend it.