Barcelona's Ciutat Vella is best known for the Gothic Quarter. The heart of the city's history, culture and local vibe, it's no wonder you'll find some of the tastiest and most authentic restaurants in this part of town. Whether you're looking for local Catalan dishes, gastro tapas or rustic hole in the wall joints, the Gothic Neighborhood has it all. Amongst the windy streets and tucked away courtyards, the Gotico hosts some of Barcelona's most well-known locales. Plaza Sant Jus in particular is ripe with excellent restaurants from Pla, to Bliss, to Cafe L'Academia and the best cocktail bar in town, Ginger. Just a short walk down the road, Plaza Reial (right off La Rambla) is a bit more touristy, but full of renowned restaurants including Les Quinze Nits, which ALWAYS has a line up, so be sure to show up early as they don't take reservations.
Another popular street is Calle Escudellers, where the chickens from Caracoles restaurant can be seen spinning in the window and known for being delicious.
Whether you're in the mood for fine dining or 'greasy tapas', the Gothic Quarter is one of the trendiest and liveliest places in the city in which to enjoy great eats in an eclectic atmosphere.