Jason was very helpful and easy going host. He picked me up at the station and showed me around the area in the middle of his busy schedule.
The house was quite newly built, typical clean Japanese style house and it was no problem with sharing 3 other people, even though I prefer staying quietly. You can be isolated if you want and you could also hang out with other people and Jason, although I couldn't because of my busy schedule.
All I needed was just in walking distance: Convenient store, (kind of) supermarket, family running Japanese noodle shops, second hand book shop and Japanese bread shop.
This place is definitely recommended and I would like to stay again if I visit Tokyo again.