A found this recently opened place last night while checking other restaurants. It has a fixed menu of eight different burgers, each having the name of a PR artist. You can also make your own. I had the "Dafne Elvira", a pork and chorizo burger, which I thoroughly enjoyed, with fried cassava sticks and natural, freshly squeezed orange juice. The service is good and the prices are better, considering its location in Old San Juan. If you don't want to complicate yourself with lunch or dinner in the Walled City then this is a great choice.