The apartment was smaller than what I had expected. But I am still okay with it, My main gripe with the airbnb is perhaps the cleanliness. The place is clear of visible trash, but the entire airbnb was very dirty and dusty. The floor & tables in the living room & bedroom had dust and dirt all over it, and there was hair in the toilet bowl. My friend and I are both guys with short hair, so it is not possible that the hair was from us.
Other than that, the entire place is as described. There are Family Mart, Lawson, and 7-ELEVEN within 2 mins of the airbnb, and Shinjuku-sanchome station is 5 mins away. If you don't mind the 10-15 mins walk from Shinjuku Station (the more happening station), then you're good to go.