The lessons are held in Catalan, not in Spanish or English, first of all. Accomodation and living expenses will be more expensive than you might have thought (if you come from the UK), as Barcelona is no longer a "cheap" city. The UAB (commonly known as "La Autònoma") is in Bellaterra, some 15 minutes N of Barcelona, easy access from the centre of Barcelona with FGC.
Last: "Barça" is only the football team. The city is Barcelona or, if you wish, BCN or Barna.