Our group of nine, including four children, were very comfortable staying here for a week. The house is split into two, with an apartment on each floor - this was perfect for our group, which had two families. The space was clean and had plenty of supplies for making coffee, basic cooking, shower, laundry, etc.
Located in a quiet, mostly residential neighborhood, very short walk to the subway station, so easy to get to other parts of the city. Not many restaurants in the area - we had to walk ~20 minutes to the Shinagawa or take the subway to Azabu-Juban to find an area with many restaurants. But there are convenience stores nearby, and a few grocery stores within a 10 minutes walk. Overall great location.
The house can be difficult to find the first time (especially at night!), but the host sent a very helpful document with pictures to help find your way. I recommend using this document when you first check in!