Great place!
1st floor area with a private bedroom and conjoined living room. A mounted heater works very well if it gets chilly. Place is very clean, and we were not disturbed during our visit at all! Check in is easy and anytime (lockbox); just be sure to have WiFi to find the place if you’re arriving from another country. Queen sized bed was very comfortable.
The place is a bit closer to Shin-Okubo station, but Shinjuku Station is only a further walk.