I stayed in several Airbnbs in Tokyo, and Ryota's place was one of my favorites! It's a bit small, so recommend for one person rather than two (unless you're a couple used to sharing tight spaces). The piano is beautiful, in-tune, has a great tone and touch, and great for practicing if you're a traveling pianist like me. You can play the piano 24/7 as long as the soundproof doors are closed. Because of the soundproofing, the room is extremely quiet. The bathroom is very clean and Ryota provides high quality soap, shampoo and conditioner for you. Very comfortable, high quality place to stay.
It's about a 7-8 minute walk from either of the two closest train stations: Ikebukuro or Mejiro (on the Yamanote JR line), and a bit tricky to find at first, but Ryota proves a video with directions on exactly how to find it.