For those looking for Tokyo-core-centric trip, this is a little off of the Yamanote line. However, what makes up for the distance is the quiet of the suburb surrounded by shops and easy access to the local JR station.
It's a little bit cramped for two people, but easily manageable for one. As a westerner, the bathroom is a bit tight, but efficient. Amenities were provided.
Takashi & Shiho were incredibly accommodating and patient, and also offered tips for local eats and shopping around Koenji.