An upscale restaurant located in a 16th century building that manages to be both informal and elegant, Quinzi e Gabrieli specializes in extraordinarily refined, simple and exquisite fish dishes.  One can truly eat like royalty here and yet have a light and simple meal.  There are abundant seafood platters as well as pasta and cooked fish preparations.  A glass-enclosed kitchen separates the dining rooms which were decorated in a style evoking Sunrise at Portofino, Sunrise at Capri and Night-time at Elba using 18th century techniques. There is an outside terrace for dining in nice weather.  The crowd is smart and the waiters gracious and welcoming.  The bread basket is irresistible,  The only downside is that the dinner menu is very expensive; there is a less expensive preset menu at lunch.  We think the fish dishes are better than the pastas.  Favorites: seafood carpaccio; steamed seafood salad; sauteed cuttlefish and artichokes; seabass baked in a salt crust; sea bream acqua pazza; steamed shrimp; a beautiful fresh fruit platter; chocolate souffle