Very centric spot and enough distant to quietly sleep. Easy to reach from the Nishi-Shinjuku station (5min walking). Very close to a combini and restaurants. For three people is too small. We were two and was enough.
The bed is nice and big (2m long x 1.6 width). The Pocket Wifi is a plus (fast and enough data to transfer photos or chat) and we didn't reached to a limit of data.