Hamburguesa Nostra is located on the top floor of the El Compadre shopping center. Once you pass…read morethe grocery store, it will be the first restaurant to your right. There are a bunch of other good restaurants here as well. There's a scenic high rise view of Madrid that makes coming to his plaza worth it. I was a bit hesitant to try this place because I did not want to eat a burger in Spain... but then I saw how crowded it was by locals. I really enjoyed Hamburguesa Nostra and wished they would open a restaurant in the States. There's a variety of burgers that you can easily customize. You can add different types of interesting sauces (such as garlic aioli, fire sauce, some avocado mayo, honey mustard, etc) that will make your burger tastes better. I ordered the truffle burger and devoured it. My burger was "medium rare", but it seemed a bit more red than I am used to. The meat tastes like high quality beef and I really enjoyed it! FYI, THERE IS FREE WIFI! You are required to put in a legit email, or else it will not work.