Pianeta is excellent!
It's an Italian bistro. The food is outstanding, and atmosphere is authentic Italian.
Service is also top rate, from the greeting at the door, to the bartenders, to the waiters. They all really are there to serve and please.
The food is really top quality, and this is from an Italian who generally prefers to eat Italian food at home since it's better quality. Everything I've had there has been very good -- I've eaten at Pianeta about 5 times before.
The atmosphere is casual, yet upscale Italian. You can wear jeans and a cowboy hat, or a jacket and tie. After all, it's Truckee, Tahoe and California :)
Great place for a quiet romantic dinner.
Very good wine selection, and knowledgeable waiters about the wine.
My recommendations for the best quality food in Trukee
Best overall -- Stella
Best Italian - Pianeta
Best broad food selection - Moody's (and has excellent entertainment)