Nice cozy place within walking distance (~700m) from the JR Otsuka station on the Yamanote line. The room, albeit small, was nice and clean with a comfortable bed and the place was well equipped for a short stay. The hosts were very nice and helpful. Although it is located in a residential area, it is right next to a 24hr supermarket and towards the station there are plenty of restaurants. Please note they have some rules you need to abide by with clear signage and they may be very quick to remind you if those rules are breached. Also, although the room is plenty large enough for a short term stay, I had trouble spreading out my 26" suitcase in the room, especially after a few days of shopping.
Overall, a great place for a short stay for those travelling light and tidy.