hi all,
this New Year holiday 2010 my family and i stayed in a beautiful two bedrooms apt in Barcelona centre, near the beach and Las Ramblas (Jaume 1 and Liceu metro st-ns) and paid about €120 a night for the 3 of us in such high season. we found it through the agency
http://www.barcelonarealestate.es/you can also try to find apt through search engine or through ads or forums and rent it directly at the landlord. A year ago i stayed at onebedroom apt. and rented a room by 25 euros a night in the centre Barcelona. Here is her contacts
http://www.barcelonatrip.ucoz.ru/, her name is Rena (speak English,French). I know, that she also gives for rent all her apartment for rent and stays at her friend´s house, but i do not know the price

.