This is a mixed review.. First, kudos (4 stars) to the staff. I found them to be very helpful and pleasant. The front desk girls took the time to explain everything to me, in the dining room an English speaking server explained all the food. As for the food, I give it 3. It was okay, not great. I ate two dinners and one breakfast. The first night I couldn't find much in the dinner to eat, but the second night pleased me more; the main dishes were sashimi and hida beef (that you cook up yourself at the table). I would also give this high ratings for location. It's convenient for Kamikochi (which is why I was there) and for moving on to Takayama. I was going to visit the Shinhotaka Ropeway, but the weather wasn't on my side.
But as for the rooms... I give it a two. The walls were so thin ( I was on the first floor in the main building) that I could hear every word on both sides. The ceiling shook when the person upstairs walked--to the point that movement upstairs turned my ceiling light on and off! It was so wet and moldy-smelling in my room that I turned on the heat to try to dry it out a bit. The place is very dated, too.
In short, the Hirayunomori resembles nothing as much as a Japanese version of a 1960s Catskill mountain resort. If that reference doesn't help you, think of any run-down family resort.
I probably wouldn't go back again, but I had good reasons for picking this place: on this, my first trip to Japan, I wanted to try a hot springs hotel experience and this one was the only one in this area I could afford AND welcomed solo travelers. Bottom line: you eye at you pay for. If you need a resort and don't have a lot to spend, it might the bill.
Try together second floor if you stay in the main building
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This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.