The love affair with flour water, and tomato sauce continues at Una Pizza Napoletana, a truly great addition to the large selection of San Francisco pizzerias. All pizzas are 12 inches, and there are only five choices as to toppings: Margherita, Marinara, Bianca, Filetti (cherry tomatoes, buffalo mozzarella), and Ilaria (smoked mozarella, cherry tomatoes, arugula). It’s the Margherita that they line up out the door for, mostly because the tomato sauce-simple, discreet-is unparalleled. The wine list is Napoli sourced, all the time. All the pizzas at Una Pizza Napoletana are a flat $20, which makes things easy for everyone.