The staff were super nice and made for a very good trip. We had older people with us who had trouble with all the little steps in the rooms and bathing areas but overall we had an excellent experience. The third floor private bath was broken so we could not see what it was like.
Come for the view, stay for the food. Excellent seasonal spread of local dishes. The kashikiri bath on the 3F was very in demand so I didn't get to try it, but the public baths on the ground floor were quite serviceable. Come by car if you can since most of the good hiking/sightseeing spots aren't easily accessible by foot, although the hotel does have a useful shuttle service to and from Tanazawako station.
Staff were adorable.