We've been here at least five times. Found the place kind of by accident because it's tucked down one of the side streets off San Felipe.
If it's not too hot out, the outdoor tables are great. I believe they have a a big umbrella at each table and you can be entertained by the people walking by and checking out the items outside the shops.
We are great fans of the nachos. At most restaurants, you run out of toppings before the end of the chips. That is not the case here (well, never enough jalapeños) They are especially generous with the meat and have always been happy to give us extra jalapeños when we ask. One order easily feeds two of us.
The quesadillas are delicious and substantial. I feel bad leaving food but if I'm going to be walking around Old Town all afternoon, the refrigerated leftover quesadilla would be probably a health hazard.
The staff has always friendly and helpful. And we're always happy to return. An added plus - the prices are for locals, not tourists.