We loved our stay at the Hoshina resort in Matsumoto. The rooms were beautiful and the onsen was heavenly. I wish I'd stayed longer just to keep enjoying the onsen facilities! The staff were very friendly and helpful. I didn't stay long but did enjoy the piano playing in the evening. We also had the tasting menu and both dinner and breakfast were spectacularly presented. If there was one thing to improve it would be to make air conditioner both lower and stronger. It was very hot out and we had a hard time cooling the room down enough. Also, the dining room walls could use a bit of a refresh.
As an European these Raikans are rather different and unique. It takes some adjusting to this special Japanese way of staying eg using there clothes, eating 20 servings for dinner, no cola etc etc - However, if you accept it and take it as an experience I guarantee you that you will enjoy this very unique Raikan/hotel… Rooms are originally designed and you sleep on the floor with a hard pillow. You eat in a dedicated private room and get 20 different dishes for dinner - some very Japanese. We had three nights here - and I can only recommend that you try it. The hot spa and baths are really great! Only small thing is the location - however, busses are running directly from outside the hotel all day and often - and takes you to the castle or the station…