This is another rustic, working-class spot with great no-frills dishes and several natural products on sale. I especially like their enchiladas with soy meat. Don't expect anything fancy, and make sure to be clear if you don't want cheese or cream. This is a cheap, central, long-established place and a great spot for a quick bite while exploring the historic center. Food tends toward the bland side, but you can request their (excellent) hot sauce on the side.
Cons: not much variety, sometimes a bit bland