I don't know where to start because everything was so perfect!! First of all, the K family was really nice and welcoming. They gave us very detailed direction for finding guesthouse, their factory to drop off our luggage, umbrellas when it was raining, drove us to Aoto station on the day of checkout, let us know the timetable of train and where to take it. When we went to a local restaurant to have dinner and drinks, we bumped into one of hosts. He recommended the best dishes so we could have really nice time.
About the house, it's a bit far from west side of Tokyo's touristic spots(Shibuya, Shinjuku etc) but it didn't matter because the neighborhood Tateishi was great itself. Cherry blossoms, small local bars and restaurants, markets..
And the house was spacious, clean, well equipped, beautiful. K family changed towels everyday for us. We had nothing to ask more because everything was already there.
Every evening, when we got to the Keisei Tateishi station ( 3minutes away from the guesthouse) we felt relieved like at our own home.
Highly recommend!!