I really enjoyed my stay at Minami's place!
The place is just at a few minutes walk from the heart of Shinjuku (one of the most beautiful places in Tokyo!). The apartment itself is nice, cozy, modern and pretty spacious.
Big plus, Minami and Shizuka are very attentive to the needs of the guests, and are always available in case of questions. They are definitely super-hosts!
In short, highly recommended!