Near Sol metro station, next to El corte inglés you have a very very busy restaurant. Casa Labra is a place that tourists and madrid people go to enjoy their croquettes and codfish tapas. In one counter you buy tapas and in the bar you ask and pay your drinks. Is not that expensive like i thought. I had one caña (glass of beer) and three croquettes, 1 euro each one. Is not surprise to see people making line in this place.
Croquettes and bacalao are the popular one, also you can try banderilla – tuna with peppers-. If you want to sit, inside the restaurant at the back they have a place with chairs and tables but i think that the point is enjoy the moment like a local, standing next to the bar, no?
“The one who drinks well does what he should”