The best thing about this place is the location (literally right next to the E04 station) and the fact that the rooms have air conditioning, which is a necessity in July.
It's a good value for solo male travelers looking for a central spot close to Shinjuku. There are also two convenience stores just outside the house, which is quite nice.
Keep in mind that the house itself is very old, so you have to put up with some musty odors and paper-thin walls that aren't great at noise isolation. And you're going to have to climb up stairs to get to both the house and your room, so keep that in mind if you've got a lot of luggage.
The host is great and very hospitable. He doesn't speak much English, but it wasn't an issue for me as everything I needed was taken care of. I'd recommend staying here if you're not too picky about your living conditions and need to be near/in Shinjuku.