This is a lovely house. Location is fantastic, in a very quiet narrow street neighbourhood. But it is only a 3 minute train ride to the craziness of Shinjuku from the local station (about 500m away), so you can have the best of both worlds. The house itself is as described and pictured. Rooms are "sparsely" but stylishly furnished.
We were only a couple, and master bedroom is fantastic, but if you planned to use the second bedroom, be aware it is very small - really only a bedroom for 1 person or maybe two small kids.
What we particularly loved was the local shops and restaurants located on the road from the house to Sangubashi Railway station. There must be 20+ restaurants there, with both Japanese and international cuisine, and varying in price from cheap to expensive. No tourists - almost every one else in the restaurants were clearly locals. We had planned to eat in Shinjuku a few nights, but found we could eat in Sangubashi very well every night of a 6 night stay.
Alex lives overseas, but communicates fantastically. Overall a great experience!