Five Guys Barcelona. Plaza Catalunya. There are several Five Guys Burger restaurants in Barcelona. The most central is on Plaza Catalunya, 1 in downtown Barcelona in El Trianglemall.  Five Guys is a popular US fast-food chain, that has earned acclaim for its burgers thanks to a combination of key factors. At the heart of its appeal is their  commitment to using fresh, never frozen, 100% beef for their patties. Their committment to freshness extends to all ingredients, contributing to the high quality and flavor of their burgers. Five Guys lets you customize your burgers at no extra cost, with an of toppings like lettuce, tomatoes, pickles, onions, and various sauces. Also, generous portion sizes, particularly in hand-cut fries, add to the appeal, providing customers with a satisfying experience. Yum.