My group of 9 thoroughly enjoyed our stay here. Kei was very communicative throughout the process, check-in was very easy with a lockbox at the door and we had no issues finding the apartment.
It is centrally located in Shinjuku, close to the green line in Tokyo that gets you around to all the major cities. We were walking distance to all the major attractions in Shinjuku. The apartment itself was very clean, and we felt comfortable throughout the stay. I would recommend this apartment to any large groups traveling in Shinjuku.