Great room if you want to stay in this part of Shinjuku. Several train stations nearby, Shinjuku station just a 15 minute walk. Check-in was easy and I was even able to check-in early! As with all Japanese apartments, it gets a bit cold in Winter so be prepared to use the Aircon if you're in the room for long periods of time.
Place had everything you need and the wifi was fast and stable - the latter is NOT normal for Airbnb's in my experience... Only negative part would be that there's no real desk, just two small foldable tables but you can make it work somehow.