Madrid is a nice city to visit, with a lot of thing to see, a bunch of great museums if you like, but the best thing in my opinion is the people and customs. I strongly recommend you visit the Rastro sunday in the morning early and see all that people buying and selling old and used furniture, books, comics, clothes, discs... and yes CAMERAS. The camera zone is all along Carlos Arniches street where fotocasion is. Usually it´s crowded (mainly if the weather is good) so be carefull with your pockets. Hope you like it. I´ll send you some photos I did there few months ago.