Time Out says
One of the best pizzerias in Sant Feliu de Guíxols
The best pizza on the Costa Brava and memorable views of the bay in Sant Feliu de Guíxols. With this winning combination, La Locanda di Nonna Flo has no rivals. Whether you go for lunch or dinner, whether it's the summer or the winter, you either need to get there really early or book a table in advance because its interior terrace, where most of the tables are, is always popular. The dishes they serve are 100-percent Italian, and both the pizzas and the pasta are sinfully good. And don't even think about leaving the restaurant without eating a Sicilian cannoli for dessert and tasting the limoncello (if you're lucky, they might even give you a shot on the house).
The man in charge of the 'show' is the charismatic Francesco. Let him advise you and you'll enjoy an intimate dinner along with an almost oil painting–like image of the beach and port of Sant Feliu.