You can rent a room in another Tango dancer's flat...

Ariadna Roca:
Mail: ariadnaroca@hotmail.com
Tel: +34687584189

Maya Kumar:
Mail: sweetmaya2@hotmail.com
Tel: +34653216102

Peter Manning:
Mail: u.who@online.no

Mònica Ramos:
Mail: contacta@apartmentsinbcn.com
Tel: +34667987195


Other interesting options...

http://www.barcelona-on-line.es/eng/youth-barcelona-hostels.htm

http://www.couchsurfing.com/mapsurf.html


http://www.nnhotels.es (Jazz Hotel 3-4 stars)