DELICIOUS! One of the best burgers in Madrid. One of those places you want to return to soon, and again, and again. A burger flavor that is impossible to explain here. An extensive menu, with very good options, also gluten free if you ask, and you can customize the burgers if you don't want any ingredients.
The service was impeccable, super attentive, they recommended options and were super explanatory. The restaurant is very small, so it is better to reserve in advance.