Mestral is a clean, bright, secure and modern student hall that's relatively central in Barcelona. It has both positives and negatives you'd expect from somewhet3 designed to host students. More people to talk to, but shared amenities, and some noise and mess by others (which will depend on your neighbours). Cleaning staff were very effective and quite friendly, but unfortunately only know Spanish so we did have quite a language barrier at times despite trying to get the message across. We felt our possessions were safe behind the locked access doors which was a plus. We did have a neighbour who threatened aggressively to call the police the second we set foot on the patio around 10pm, which was over the top as we were whispering almost in audibly between the two of us. Apparently this is a recurring problem (according to fellow guests).