Be aware that there are a lot of pick-pockets running around BCN, especially at the touristy spots (Rambla, Pla. Catalunya, Pla. Reial etc.). Nearly everyone I knew had got robbed at least once. So leave your wallets and credit card collections at home and choose wisely what to take with you into the streets. A good idea is to replace your thick wallets by the slim plastic cases (estuches) of the Metro company (TMB) that can be obtained at the TMB offices. Placed into your pocket, their slimness makes them pretty insuspicious.
Before arriving in BCN, consider that you most likely will be on the hunt for a flat at first. You therefore will be in need of a youth hostel for a few days. Book in advance! I forgot to do it, and it was hell finding a bed for a night.
When arriving in BCN, usually a major concern is to stay connected or to be reachable for others. The best option is to buy a prepaid SIM card for your mobile phone (Amena, MoviStar, Airtel), e.g. at FNAC, El Corte Inglés or any mobile phone store.
If possible, don't come by car! Parking is a big problem and a constant struggle in BCN, and even if you found a (legal!) parking space in the street, chances aren't too low you find your car broken up the next day.
But after all: BCN is a wonderful, inspiring and international city that is going to absorbe you. Even if you are to encounter annoying problems occasionally, you'll still be in beautiful and charming BCN.
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