I went to Stagione, which was listed as the second best Italian restaurant in the Zagat Survey in Nagano (published this March in Japanese).
It is located in a good place in the Hotaka area and you can see authentic rural Japanese scenery and a wonderful view of the Japan Alps from its wide window.
As Zagat reported, the restaurant is very neat (perhaps too “neat” for a place to eat), the dishes and desserts are tasty and stylish like the photo, and it’s not so expensive.
Zagat Survey is a guidebook (also called “American Michelin Guide”). It has a voting system that relies on locals. They ranked restaurants and hotels in Nagano using the result of 5,000 votes.