it is august so lots of madrilenos will be on holidays themselves. puerto mayor might be a good spot, there was a great cider/roast chicken hall i went to years and years ago that always had a great atmosphere, it was near atocha train station, will try and find it.
this place sounds interesting
cider place is casa mingo, basically all they really sell is cider, roast chicken and manchego cheese, great spot
[broken link removed]