Me and my wife absolutely loved our stay at Ken and Mayu's place. Going back to their house after a full day walking around Tokyo felt like retreating to a small village in the country side. Even though their place is located close to Ebisu Station, with lots of restaurants around and at walking distance to Shibuya it is also nice and quiet, hidden from all the madness of the city. The room is full of character, the bed is very comfortable and the bathroom is amazing. On top of all that, the owners are the sweetest people we've met in Japan. They live upstairs with their kid but that didn't bother us at all. It actually gave us a chance to chat very often and enjoy their company when we bumped into each other on the way in or out of the house.
We liked the experience so much that decided to book it again on our way back to Tokyo. Highly recommend if you are a laid back couple (with or without a young child).