Chouquet's on Fillmore
Chouquet's, on Fillmore in San Francisco, is a really nice French restaurant. Not pretentious at all, it yet serves some delicious dishes, like a braised lamb with truffle puree, or some fantastic foie gras and chocolate desserts.
The atmosphere is very casual, the staff very friendly (they're all French!), and the price is decent.
I absolutely recommend this place...