I stayed three weeks in Masa's house with a friend. It's clean, spacious and well equipped. The house is close to a lot of amenities (metro station, konbini, restaurants, pharmacy...). The neighborhood is pleasant.
Masa is a very kind person. When we needed help, he was present to guide us. When my friend had a problem at one eye, he brought us to the doctor. We couldn't hope for a best host.
I have nothing negative to say. With this house, we had a comfortable travel in Tokyo because we had a safe place to stay. It was a pleasure to stay here and we would come back without hesitation.