Amazing location! Only 5 min walk to Shinjuku-Sanchome station and about 10 to Shinjuku JR station.
Also very spacious. And the place is pretty self-sufficient (separate tub/shower and toilet, washer, etc) There’s a Lawson convenience store right next door.
My only suggestion is to get bed linens instead of mattress protectors as cover, as a germaphobe that makes me a bit uneasy.
Very easy and quick communication.
Other than that, I will definitely stay here again! Thanks Haruka