I arrived to Barcelona through Erasmus and absoluitely loving this city (go figure!). It is simply impossible to ever get bored!!! What was hard was finding suitable accommodation, anyone who has seen the movie "casa de locos" will understand
I got in contact with a serious company providing accommodation (lots of rooms for students) online and went to their office where they took great care of me. After two weeks of looking myself (and finding only sh.. rooms) I found a great room after an hour browsing through their database and then visiting the two rooms I couldn't choose in between.
They also provided me with access to their private guestlist at most clubs in Barcelona which has been great (and somewhat devastating for my nights sleep)...
If you need some help I really recommend you heading to their office or checking out -snip-
[ Edit: Sorry, no promos please. ]