Masami is very detailed in giving instructions, I have received very helpful directions to the apartment before my trip. The location is near Hatagaya station on Keio New Line (which is 2 station away from Shinjuku, but for this line you cannot use subway day pass). Once you get out of the station, there is about 15 minutes walk to the apartment. The room is spacial compared to others in Tokyo and Masami left some snacks for us as well.