This place has clearly been set up as a pack-em and stack-em cheap Airbnb along with the unit next door.
The good:
Great communication.
Easy self-check in.
Reasonable foot access from Shinjuku but probably not with heavy bags. Get a taxi.
The place is small but that’s not unusual for Japan.
It was clean and tidy.
The double bed was very comfortable.
The bad:
It’s funny how a measly $100 can make such a difference to things. My wife is allergic to seafood, we needed at least basic kitchen facilities in Japan. This could only be described as horribly inadequate. No glasses, no plates, one broken knife, no bottle opener! I know most wont care about this as eating out is what most do in Japan but it mattered to me.
Don’t try and sleep three in here unless you like climbing over each other, particularly if you need the bathroom at night!
Ive stayed all around the world in Airbnb and been a host myself. Just a little bit of time and money will fix these issues!