My family of five stayed at the charming Haneda guest house at the end of a three week trek all across Japan. The guest house is a standalone three story house that is well outfitted for a comfortable stay.
There's a large study with ample desk space for getting work done. There's an entire floor for the family room, kitchen, and dining room. And upstairs are two bedrooms that we sleep five in.
We were there in there hottest part of the summer (August) and the air conditioners kept us nice and cool. There are a wide variety of restaurants and shopping nearby next to the train station.
Lei as a host is amazing. She personally escorted us from the train back to the house the first time. Then, she met us at the train station on our way back to the airport. No other host took this much care of us. She is the best host. Best.
I would recommend this place to anyone staying in this area.