The pictures of the apartment are very accurate. There are a pair of very comfortable twin beds and also a pair of stacked beds that we did not use. There is generous storage space for baggage beneath the stairsto the room containing the kitchen and bathroom .
The downstairs room also has a full length mirror, several accessible outlets, and a coat rack with hangers.
Upstairs, in addition to the kitchen and accessories there is a very large washer/ dryer for your clothes .
The neighborhood has easy access to both the Maranouchi subway and the JR line. If you walk beyond the Koenji train station you will find food of every kind. The main street leads to a covered mall where many stores sell used clothing. You can meet all your daily needs close to the apartment, including many restaurants. If I return to Japan again I would surely consider staying at this place.
As a last note, I have been to Japan more than 50 times on business, so I did not ask our host for assistance. Still, she did make interesting suggestions for places to visit . Very good communication.