My other half and I stayed at Takashi and Shihos place for about 2 weeks over the New Year. The room was incredibly easy to find, they sent lots of instructions on how to get there which made it very easy for us and they met us on arrival. They are incredibly kind hosts that will make sure you are comfortable and looked after which is wonderful. The room was clean and comfortable - you are very close (9 mins) to Shinjuku and Koenji has a significant amount to offer too. You would struggle to house any more than 2 people in this room, but it is warm (Takashi and Shiho send examples on how to heat the room), safe, quiet and comfortable. I have a bad back and managed fine on the beds supplied. It is definitely more of a place just to sleep, Its a small room, so if you’re just looking for somewhere to sleep in Tokyo this is perfect. I would absolutely stay here again in heartbeat.