The Barcelona circuit — Sagrada Família, Park Güell, the Gothic Quarter, Casa Batlló — takes two days and is worth doing. A longer stay only makes sense if you leave that circuit, because repeating it does not fill a week.
The districts nobody visits
Gràcia. An independent town until 1897 and still feels like one — a grid of small squares, each with cafés spilling into it, independent shops rather than chains, and a genuinely local evening scene. Plaça del Sol and Plaça de la Vila are the anchors. Fifteen minutes from the centre by metro and a different city.
Poblenou. The old industrial quarter, now a mix of converted factories, design studios and quiet streets, with the calmest stretch of Barcelona beach — Bogatell and Mar Bella — used mostly by residents.
Sant Antoni and Poble-sec. Where the food is. The Sant Antoni market and the tapas street of Carrer de Blai, where pintxos are a euro or two each.
Horta and the Carmel bunkers. The bunkers are a former anti-aircraft position on a hill with the best view over the city — free, and best at sunset, though it has become popular enough that the neighbours have asked for restraint about noise.
Getting out of the city
Collserola, the wooded range directly behind Barcelona, is reachable by FGC train in twenty minutes and offers proper walking with the city and the sea below. Most visitors never realise it is there.
Montserrat, an hour out — a serrated mountain with a monastery, reached by rack railway or cable car, with walking trails above.
Girona, 38 minutes by AVE — intact medieval walls you can walk and one of Europe's best-preserved Jewish quarters.
Sitges, 35 minutes by local train, for a better beach than the city's.
Tarragona, an hour, for a Roman amphitheatre above the sea.
The tourism question
Barcelona has a well-documented tension with mass tourism. Rents rose sharply, short-term rentals displaced residents in parts of the old city, and there have been protests and municipal restrictions.
None of it is directed at individual visitors, and Barcelona remains welcoming. But a few things register:
Stay in a licensed hotel or a licensed apartment. Unlicensed short-term lets are the specific grievance and are also illegal.
Stay outside the most saturated streets — Gràcia, Poblenou and Sant Antoni are all pleasant, well connected and less pressured.
Catalan matters here. The city is bilingual and signage is often Catalan first. Spanish is universally understood, but bon dia and gràcies are noticed and appreciated.
Practical
T-casual gives ten metro, bus and tram journeys for around €12.55 — far better than singles.
Book Sagrada Família two to four weeks ahead and Park Güell's Monumental Zone likewise. Nothing else needs advance tickets.
Pickpockets are a genuine, organised problem on La Rambla, the metro, Barceloneta and around the Sagrada Família. Bag in front and zipped, nothing in back pockets, phone off the café table.
Eating times. Lunch 1:30–3:30, dinner from 9. A restaurant serving at 7pm is serving tourists.
How long is worth staying
Five to seven days. Two on the famous circuit, and the rest in the districts, the hills and the day trips — which is when Barcelona stops being a checklist and becomes a city you know a bit of.