I chose the right place to stay in Tokyo!
The place was sparking clean, you can get everything you need, (some amenities needs extra money but it doesn't cost that much), and also you can get continuous Wi-Fi connection.
And of course, the host was really a helpful, and easy to communicate so you can ask anything you need!
There's a convinience store(Famliy mart,1min walk),and it accepts credit card.
It takes about 10mins from Koenji sta to this place, so if you are having the pretty heavy stuff with you, it's gonna be quite a walk but all the way to this place is so flat, so there's no problem with suitcase.
In overall, HIGHLY RECOMMENDED!!