This is one of those restaurants where customer service isn't high on their list of priorities. The server wasn't overly concerned about making sure nothing in my lunch would kill me; basically, he could barely be bothered.
The food didn't kill me but was mediocre at best, a bit like Dos Caminos in style. At least at Dos they make the guac table-side and the servers are very nice at the 27th street locataion.
No reason to go back nor waste blogspace talking about Zona No-Go-A.