3 of us stayed at Koichi’s place in August for 2 nights. The space is lovely and clean. It is in a fantastic location, only a couple of minutes walk from the train station and a convenience store.
However, it was too small for 3 people. I would advise couples or singles only because it was a squeeze to fit 3 adults in a small space.
Other than that it was perfect and I would stay there again as a couple.