The whole experience was just perfect. From the friendly and helpful pre-arrival communication with Kan and Shoko, to Welcome messages on arrival, the convenient location of the house and the joy of staying in a house rather than a hotel or apartment in Tokyo city - it was all just wonderful.
As other commenters have mentioned, the house is tiny (best suited to 1 or 2 people max), but it has everything you would need and more. With the colder weather closing in, we particularly appreciated (actually loved, loved, loved!) the under floor heating, which heated the small space quickly and toastily. We would absolutely stay here again if we get the chance to come back to Tokyo again.