My group consisted of four friends on vacation together. The house was absolutely amazing since we each got our own room, but the best part was our even more amazing host. May and her husband were probably the best hosts that my group has ever experienced. They gave us detailed directions of how to use everything in the house and even gave us small housewarming gifts. We felt comfortable right away and we knew we were in great hands. At the end of the trip, they even helped us get our limousine bus tickets for our return ride back to the airport.
The area was also great too! Very close to the train station or you could just walk to the main Shinjuku area (15 min walk). There's also a 7-11 right across the street from the house if you need to get anything.
Some Tips for Future Guests...
1) Portable Wifi: This little gadget was an absolute lifesaver. We took it around all of Tokyo and lasted almost the whole day.
2) The house has two bedrooms on the first floor, the kitchen/living area on the second floor, and two more bedrooms on the third floor.
3) Airport Limousine Bus: If you decide you are going to take the limousine bus back, you can store your luggage at the hotel. We did it at the Hilton, but not sure if all the hotels do it.