To be clear, to stay at this location is to stay in a family's guest room. You'll have your privacy, but you're also sharing a space with Ann, her husband, and their two daughters. I wouldn't call this either a negative or a positive, but something worth knowing if up until now you're been lodging in other empty AirBnB locations.
That said, these are some truly wonderful people, and I'm happy to have had the chance to interact with them before leaving Japan. The location takes a bit of legwork, and maybe stopping for directions, but Ann is exceptionally communicative and helpful. Once we found the place we were greeted and shown around. It's great if you're looking for a sort-of-homestay-but-kind-of-not-really experience. It was very welcoming, and I'm glad I had a chance to stay here!