We enjoyed our stay here, in a quiet neighbourhood only two stops from Shinjuku station. There are restaurants and convenience stores nearby and the metro station is an easy 5 minute walk away. I think this place is ideal for 2-3 people, though you could fit 4-6 if you don't mind sharing beds and sleeping in the living room. The apartment is quite old but Masami has decorated it nicely and included everything you need, including some snacks and washing powder, which was appreciated. Being an older apartment, you can hear people in the hallways, but it generally doesn't last long. Unfortunately while we were staying there was a loud group of people above us, playing drinking games. They carried on for hours into the night. I'd suggest this place is not suitable if you want to make lots of noise or play drinking games. Overall, a great stay 😊