I traveled many times to Barcelona (and as well to other cities about Europe) and I can sustain that Barcelona is best for holidays in whatever time of year.

El Gotic, as well known as Barri Gotic (’Gothic Quarter’ in Catalan) is the heart of the former city of Barcelona. It is placed from La Rambla to Via Laietana, and from the Mediterranean sea seafront to Ronda de Sant Pere.

Ronda de Sant Pere is a thoroughfare in central. La Rambla can be considered a program of shorter streets, apiece differently named, hence the plural forms Les Rambles (Las Ramblas). From the Placa de Catalunya toward the seaport, the street is in turn the Rambla de Canaletes, the Rambla dels Estudis, the Rambla de Sant Josep, the Rambla dels Caputxins, and the Rambla de Santa Monica. Building of the Maremagnum in the primeval 1990s resulted in a continuation of La Rambla on a wooden paseo into the harbor, the Rambla de Mar.
Despite respective changes undergone in the 19th and ahead of time 20th century, many of the buildings date from Medieval times, some from as farther backwards as the Roman settlement of Barcelona. Remains of the squared Roman Wall can be seen around Tapineria and Sots-Tinent Navarro to the north, Avinguda de la Catedral and Placa Nova to the west and Carrer de la Palla to the south. El Call, the knightly Jewish quarter, is located inside this region too.
The Barri Gotic retains a complex street plan, with many little streets opening come out into squares. Almost of the quarter is unopen to lawful traffic although open to service vehicles and taxis.

Check other attractions, check cheap airlines and visit Barcelona. Plan your visit because there are so many things to see. And leftover something to visit future time.