We stayed here over the Christmas and New Year holidays, and had a fantastic time. The apartment is conveniently located between both major stations and subway stops, and it was an excellent neighborhood to walk around in. It was easy to walk to several temples and shrines both large and small, which was really cool for New Years Eve.
We had five people and did not feel too crowded, and enjoyed hanging out in the living room in the evenings. There's a large table in the kitchen which was able to fit us comfortably for meals and a couple of evening board games.
Kentaro was an excellent host, quick to respond, and even provided a few snacks on our arrival. The apartment was a wonderful base for exploring Tokyo, and we would all be happy to stay there again.