Junko's place is as advertised. It's located in a quiet neighbourhood in Koenji but there's everything you need nearby. There is a family mart 30 seconds from the apartment in case anything is needed. The stroll from the apartment to Koenji station takes around 10-15mins at a leisurely shopping pace. I had 2 young kids in tow so it took a little longer. There's plenty of Japanese restaurants around the place with Mos Burger, MacDonalds and KFC thrown in.
The apartment was squeaky clean when we arrived and Junk was there to check us in. We had 2 kids in tow so we appreciated that she allowed us to check in earlier. There isn't much space for kids to run around in the apartment but its sufficient to just move around. My only gripe was the position of the toilet bowl. I am 1.8m tall and the toilet bowl is placed so closed to the wall that I had to sit side ways on it.
I would recommend Junko's place readily for her hospitality, the apartment's location as well as the fact that it's located on the ground floor means no carrying of luggage or baby stroller up and down stairs every day.