There are plenty of sidrerias (cider bars) in Madrid, but this one in the gay-friendly Chueca district is a huge stand-out for the quality and, especially, the quantity of the complimentary tapas. 1.50 a 'caña' isn't cheap, but you'll get a steaming pile of piggy, bready delights along with it, and that's every time you take a drink.
Also a great place for vast filled 'bocadillos' (baguette sandwiches), and various other tasty 'raciones'. Just watch out for complimentary paella - myself and others have been laid low by food poisoning for some time after a visit. The fact that I'm still recommending the place tells you just how good it is.
One final thing - get there early if you have any kind of designs on a table.
c/ Infantas, metro Chueca
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