Modern Japanese self-catering cottage in the hills high in the north of the valley, run by nearby winery 98wines. The living-dining room opens onto a terrace with spectacular views down the valley towards Mt. Fuji and there is also a small Japanese garden. An outbuilding connected to the main house has a traditional bath, also affording great views. Sleeps up to eight people in a mixture of Western-style and Japanese rooms. Note that this is a serene, rural location with no shops or restaurants nearby - best coming by car. The owners can arrange for a chef from a local restaurant to come and cook for you though if you wish. Also available to book through Airbnb.
Online booking: https://en.stayjapan.com/area/yamanashi/koshu/pr/11694