One Mario Batali restaurant replaces another.  Formerly Enoteca San Marco, Otto Enoteca Pizzeria now holds court at the Venetian.\n\nAmbiance:\nSit \"outside\" and enjoy the scenery.  Diners at Otto can enjoy the beautiful hotel decor, as well as performing artists who entertain those sitting or walking nearby.  \n\nService:\nVery friendly and helpful.\n\nFood:\nI thought I knew what al dente was until I dined at Otto.  Now I question every al dente pasta I've ever had.  I ordered the Spaghettini with sauteed mushrooms, garlic, and thyme $19.  The pasta was cooked and seasoned perfectly, and the portion was just the right amount as well.  The ingredients were simple and fresh, which allowed each of them to really stand out.  The variety of mushrooms were especially flavorful and distinct.  For dessert, we ordered three flavors of gelati $9; Colorado River Coffee Roasters espresso, pistachio, and dark chocolate malt.  The gelato was soft, rich and flavorful, with the pistachio and dark chocolate malt my favorites.  \n\nOverall:\nA great dining experience if you are looking for a relaxing meal in a beautiful environment.  Otto serves quality food in an unpretentious atmosphere, which I can appreciate.  Next on my list to try at Otto is their pizza.