good websites for cheap apartments??

Hi to you all,
I am going to be living in Madrid this summer (and for the rest of the year) and I need to find a good and cheap apartment (shared accomodation is great too). Do you guys know of any good websites where cheap apartments are advertised? It would be greatly appreaciated!
thanks
(this is not for short term stay...no vacation aparment)
heidi

The best place to start looking.
http://inmobiliaria.segundamano.es/subseccion.cfm?categoria_id=69&subcategoria_id=6300

There's also http://www.Idealista.com . These are "normal" apartments and not intended for "holiday" stays.

Saludos, MadridMan