posted by in Spain forum
As a couple of people mentioned before, Idealista is a great website and its how I found housing in Madrid. Sign up so that you get an email the second an apartment that matches your preferences is listed. It means you'll be the first to contact the owner and are more likely to arrange a viewing. Pisocompatido is also a great website, similar to Idealista. If you want the hassle taken out of looking for a place then Spotahome takes care of the search for you (for a fee) and their customer service is pretty good. And then of course there's just landed!
Good luck with the search :)