I often would frequent Patacon at lunch prior to my company moving. Patacon offers friendly service (some of the servers do not speak much English but you manage) and great empanadas. The portions are so big that you may want to think about sharing a plate with someone. Bistec a Caballo, thin flank steak with rice, plantains, beans and an egg, very tasty.
Pros: Food and service
Cons: Sometimes can be loud, very small