I absolutely love this place. Given its popularity, the lines can get long during peak hours but I can assure you it is totally worth it.
I've had the cordero (lamb) which comes with a crostini, side salad, and some sort of pickled mustard seed spread. I've also had the pollo a la parilla (half roasted chicken) which I really loved the even though it didn't come with any sides. But the chicken was cooked so perfectly that it didn't matter that it didn't have any sides. The empanadas have always been really good too. My favorite ones are the veggie. Both times I went, they did not have the chicken wings which I have been told is a must try.
This place can get expensive depending on what you order. The lamb was $16 while the chicken was $12 (I liked the chicken a lot better). Even though it's really busy and crowded, the service has always been great.