The house is nice. There's a play ground just outside of the house which is fun for children. The location is relatively convenient as the train station (Yotsugi) and Family Mart are nearby. There are two bathrooms in the house, and they have the high tech toilets which I really like. You can use the two pocket wifis from the house when you go around Tokyo.
There are only two drawbacks. First is location: Yotsugi station is outside the Tokyo Metro Subway Lines and is not near Asakusa. Even if you get the 72-hour Subway pass, you will still need to pay 160 JPY (per person) every time you go out. Second is number of persons to accommodate: the ad says it can accommodate 16+ people (We are only 11 by the way). This is true but you will have to move furniture to make room for the futon bed floor mattresses. Since I do not like to move furniture because of fear of damaging it, I just slept on the sofa bed which is the least comfortable. (Of course, this is just a minor drawback and my own preference.)
Overall, the house is awesome with all its amenities. Hirotake-san is fast and easy to communicate with. 4/5 :)