Hi Natalia! If you look a few threads below this one you'll find a thread about Barcelona lodging -- and that's just one of the most recent ones posted. Use the SEARCH link above/right and type BARCELONA HOTEL or BARCELONA HOSTAL and you'll find literally dozens of previously posted, recommended places to stay.
Anyone have any fresh ideas for inexpensive lodgings in Barcelona for Natalia??
Good luck! Saludos, MadridMan