I stayed for 2 weeks in Ko's apartment and had a very relaxing and comfortable stay. Ko is a wonderful host, he met me in person to help me carry my luggage up and show me the apartment. During my stay, he checked in a few times to make sure I was comfortable and to offer me fresh linens, and upon check out, he came by again to help me carry my luggage down. It was very reassuring knowing that Ko was downstairs in the cafe should I need him for anything, but during my stay, he was very respectful and gave me my privacy.
The apartment is spacious and very well located, just a few steps from a 24-hour supermarket as well as the train station, from where it is a short and pleasant ride into the city. The street below has many boutique stores, which are fun to explore. The tea shop across the street is particularly nice, and they might offer you some freshly brewed hot tea while you browse. There is also a shop of Turkish wares further down the street. The larger area, Suginami-ku, is delightful, with numerous local antique shops, cafes, vintage fashion, and jazz. Each of the four stops is worth visiting. And then if you go one stop In the Mitaka direction, you'll find a town with artist roots which is full of hip vibes and counter-culture. There, you can also find a zoo and the Gibli Museum.
Some reviewers mentioned the train noise but it didn't bother me. During the day, you can hear trains arriving and departing along with the announcements and ekimelo. The last train is late in the evening. The only slight discomfort I encountered during my stay was that it was a bit cold, but Ko-san generously provided an extra heater. Overall, I had a wonderful stay.