The space is as advertised, and is situated in a very calm corner of Hatagaya. There are many small shops in the area and also a small supermarket that can be useful if you are up for cooking in the apartment.
If you are a larger person (I'm 5'10) the single bed the venue has might be a bit small for you, but during the winter it wasn't cold or particularly uncomfortable, so I can say I got a good nights rest staying here.
The room is kept very clean and in really good shape. The host was SUPER kind and very caring for my specific needs during the stay.
One thing to take caution for is the size of the bathtub, because it's VERY small. However I must point out that it was still ok and fun even since you can definitely relax and bathe in it still because the hot water works perfectly and it was nice and cozy even if a bit small.
The space also has a surprisingly large refrigerator and will be a great asset if you are planning to have a longer stay here.
The location itself is good depending on how you plan to spend your day. Generally Hatagaya doesn't have the best access to all of Tokyo and you aren't exactly very close to the station either.
The upside is that the location isn't touristy at all, and rather on the quiet secluded side for a calm quiet sleep experience.
Overall I enjoyed my stay and would recommend this venue if you are looking for a place to stay near Shinjuku.