Fantastic place in Koenji, with plenty of restaurant and shopping areas near Koenji station. Very close to Shinjuku and Harajuku by train. There is a FamilyMart three houses down that is opened 24/7 for snacks, water, and ATM. There is also a post office almost next to the FamilyMart.
The place is comfortable enough for three people. Bathroom is somewhat on the small-end, if you're on the tall to large scale, you might have some trouble using the toilet.
Junko was an amazing host and was always ready to help my friends and I during our stay. I would definitely recommend this place for visitors staying for Tokyo.