West Hoathly Seagull
Honorary Ruffian
Guadi's Casa Mila is also worth a visit, the roof terrace is amazing!
I would certainly echo that; a mate and I visited in 2007 and I found myself seriously fancying an apartment in there (some are still occupied by normal residents - you just get to see the one on the top floor). For food, we found a market cafe (probably near the one mentioned on here). I had paella, the best I've ever tasted, mate had pasta, then I had salt cod (delicious and well worth trying if you can), while he had chicken. We had a bottle of house white and the whole meal came to 23 Euros. With a couple for a tip on top, 25 Euros for a superb meal was cracking value. Mind you, don't go ordering a mixed grill unless you know what it is. We did: you get a plate of several kinds of meat, and nothing else. Safety wise, the only place I felt threatened was in El Raval; I had read in the guide books it had quite a lot of good restaurants, but it seemed rather deserted and we got out rather quickly. The rest of the city seemed fine - you have to watch for pickpockets in any big city.