Location was amazing - we stayed for about a week and fell in love with Nakano. It was one stop away from Shinjuku on the Chou Rapid, full of little alleyways with izakayas and restaurants, and the apartment was an easy 5 minutes from the station.
The place itself is small but very clean and well-equipped with everything you need. Netflix on TV was a nice bonus.
Communication with Aileen prior to our stay was great - she sent us very detailed instructions. Unfortunately we did not really speak to Aileen or meet her during our stay - this didn't really detract from the experience but some 'local recommendations' or insight may have added a little something.
All in all, loved it! Would definitely recommend.