We stayed here for 16 nights and it served as a great home base while in Tokyo.
Masami and her staff communications were prompt and appreciated. They provided great instructions and information for the area.
The apartment was located about a 7 minute walk from Hatagaya Station. (We used the north exit when we didn't have bags but the south exit has the elevators). The "New Keio Line" (not to be confused with the "Keio Line") serves Hatagaya Station was very convenient. It allowed relatively easy and less crowded access to the east side of Tokyo (Akihabara, Asakusa, etc with one or two transfers). The short ride to Shinjuku provided access to the west side of Tokyo. The walk from the New Keio line part of Shinjuku station to the JR Lines (ex: Yamanote line) is about 5-7 minutes.
The apartment itself was well stocked with bathroom and kitchen amenties. There is no standard oven but there is a two burner stove. Bed and pillows were great.
Would stay again on future trips.