First restaurant we visited in Madrid!
It was a very simple tapas place, but had 1.5k reviews on Google (at a 4.5 star rating).
We focused on the bread tapas… got the Iberian Jamas (and one with cheese), the matador, and veal meatballs. The last two are a must try.
For drinks, got a pitcher of sangria (only 10 euros). They also gave us a free beer each.