Loca is just at the edge of Old Town and they offer a little more variety and higher quality than pretty much all of the kiosks and other 'open-late' fast-food spots in the centre. The eats are actually quite decent for a fast food place and there are some interesting things on the menu, blending South American, Italian and Middle eastern cuisines. Even a few vegetarian items available. We quite liked their fried chicken and homemade pitas with hummus. Pizzas will set you back about €7, drinks prices are reasonable and they've recently opened a shisha-smoking lounge next door, also open late.