It was a pleasant stay in Masami's apartment, I was very lucky. Not only cosy but also warm during Tokyo cold rainy day eventhough we did not switch on the heater. The building insulation must be very good.
Everything just look like in the description except the room size. The flat is spacious enough for a family of three (Asian size) but perhaps rather cramp for European standard. However: bathroom hot water is superb, sofa bed is comfortable and Masami has kind enough to prepare umbrellas for guest to borrow. Doonas were fabulous, wish I could bring it back to Canberra.
The neighbourhood is quiet, not too difficult to find as long as you follow the guidance. Conveniently located only two stations away from Shinjuku train station. Best part, Hatagaya's station got elevator therefore you do not need to drag your suitcase through the stairs.
We did not have a chance to meet Masami but she is contactable during our stay in her flat. I would highly recommend this place and look forward to stay here again when I have opportunity in the future.