This tiny informal trattoria is in a class by itself.  Their formula is simple.  Pick the best possible ingredients, mostly, seafood, and prepare them simply and elegantly.  The food is absolutely exquisite and delicious and the professional staff extraordinarily welcoming.  In a room dominated by a long bar where you can see through to the kitchen, there are seats for 22.  The menu changes constantly accordingly to what’s available in the market so we could happily eat here every night.  Be sure to make a reservation in advance.  Favorites:  Grilled razor clams; clams with ginger; grilled bronzino;  warm calamari salad, spaghetti with bevarasse (Venetian) clams; grilled octopus with gazpacho sauce.