My family and I, 5 people, spent 4 nights and all of us felt very satisfied with the staying experience.
Rumiko-san the host responsed fast and check in/out were smooth. The house locates near Koenji station and Chuo line. This combination was convenient for us who mainly took visits in Chiyoda-ku and Bunkyo-ku. Rooms are quite clean and FULL of living things. The pocket wifi helped a lot especially for my family who carried no sim cards.
In short, 5.0 deserves.