Language exchange/Intercambio @ O'Neill's
Quite probably Madrid's first (and best :D) language exchange is still going strong every Tuesday at O'Neill's Irish Pub.

There's no need to sign up and no need to worry about your level or any of those awkward classroom questions!
Just come and have a drink, meet some new and interesting people and practice a bit of your desired language in the process. 

It's fun, free and everyone is welcome!