Our group of 5 ended up booking 2 stays at Risako's Airbnbs, since we started our trip off in Tokyo, went to other cities in Japan, and then ended in Tokyo. The rooms themselves are nice. We had no issues with the beds or bathroom situation. The two rooms we stayed in had a separate toilet, sink, and shower which made it easy for multiple people to get ready in the mornings. The rooms did get a little chilly, but keeping the heater on at a controlled temperature really helped to keep us comfy. Risako is a great host, and whenever we ran into issues we got responses back very quickly.
The only slight downside to this location was the distance to the trains. While it definitely would not be an issue when it's warmer, the cold was a bit annoying to walk through at night when we had to get back to the Airbnb. It's around a 10-15 minute walk from the station, so just be sure to factor that in when picking this Airbnb!