Awesome prices and great tapas offers the Puerta del Sol in. My first impression when I walked in the door was that the room was quite and dull your and little people, but was pleasantly surprised when I tried their food.
Puerta del Sol offers great tapas to cool prices. Tested many different dishes when I shared with my girlfriend and all was good. A little boring room also was diluted by the fact that it was pretty empty. But all in all very affordable.