La Tita Rivera
Don't be fooled by the cheesy sign outside. This is definitely not a German themed beer garden. It's a modern clean bar come restaurant. The best part is the terrace at the back. A wooden decked oasis in the heart of Madrid.
La Tita Rivera has a couple of beers on tap even a darker one which is rare in this town. They serve pretty decent food even if it's a tad over priced for the portions.