Seiji is a very good host. He waited for my arrival and explained everything clearly. Unlike many "virtual hosts", he provides almost all basic needs and take care of guests needs.
Location is quite convenient, withing 5 mins can reach Shinjuku Sanchome metro station. In the station, there is a high quality department store "Isetan", with amazing supermarket. Besides, there is another good supermarket "Ito Yokado", where can get almost all stuffs there.
The wifi connection in apartment is quick and unlimited. Seiji is also quite warm to provide pocket wifi as description.
This is a gorgeous stay in Seiji's apartment, if I have the opportunity to visit Tokyo, his place is my first choice.