This is a great place to stay for families with children. It is very close to JR line (Shin Okubo) which is one stop away form Shinjuku. There are many places to eat, with supermarkets and 7 eleven just around the corner.
Kei is very responsive and even allowed us to leave our luggage at the house until 4pm as we had a late flight back home.
The house has all the amenities you would need and we didn’t have to buy anything except our food.
The pocket WiFi was the best thing ever as we could carry it around everywhere we went allowing to access internet while exploring Tokyo.
House is located in very safe neighbourhood and I would highly recommend staying at this house.