We ate lunch here yesterday and it was very nice. I had a double cheeseburger with a cola and fries and my partner had the chicken burger with the same. It came out to less than 15 EUR for the both of us. The food was tasty. The menu is not extensive, but if you are hungry and looking for a nice burger and fries, this is a great option. The portions were large, too. We will be back before we leave Madrid.