The apartment is pretty spacious and is enough to fit 4 comfortably. All essential amenities are provided. It's located within a quiet neighbourhood but its within 5 mins walk to nearest train station, 24hr supermarket and a lot of eateries. You can even walk to Shinjuku station if you're up to it!
Only bad thing is that it's on the 2nd floor and traffic noises can get pretty loud as the main door is not very insulated but it was still acceptable for my family with a 3 yr old girl.
Communication with host was excellent too. The hosting team was both prompt and helpful.
Overall a great experience staying here.