Yi is very responsive and helpful. We were a party of two adults and 2 twelve year old boys and the space felt a bit tight for us. The boys slept on the futons in the living room which is also the kitchen area. It was great to have a kitchen to cook meals and there is a grocery store 7 mins away. This place is located in a residential area so it is quiet. However not a lot of restaurants near by, but if you walk for 25 minutes you can find more places to eat. The Shinjuku Station is easily accessible.
I recommend taking the Narita Express direct from Shinjuku station if you are leaving out of Narita Airport, especially if you have big luggage. It is a luxury train about 3960 yen.
If you have kids get a place near the Odaiba area. This Airbnb location is excellent to access shopping, night life in Shinjuku area.