Great place. Small inside, but that's Tokyo. Immediate hot water in the shower. Clean. Lots of plugs.
The place is in an outstanding location. I'm NOT joking - the entire surrounding area is solid restaurants - mostly Japanese, but some Indian, an Italian and a few others down the street. Even a Bob's Big Boy down the street.
Walking distance to a 7-11 (your best friend when everything is closed and even for morning coffee). The lobby is easy to get into, two elevators to take you up to the 12th floor.
It's less than a five minute walk from the F12 Higashi-Shinjuku subway station. From there, you can get ANYWHERE. There's a bus stop literally in front of the building. There's also a fair amount of traffic on the street (some noise at times), so that means there's a steady flow of taxis you can hail as well.
The apartment has a washer/dryer that works well. It has an on-demand water heater for showers that heat up almost instantly. The host is super responsive.
Great place!