Finally, a place with Mexican food that actually attempts to be authentic. The menu is pretty diverse including dishes from regions outside of Mexico. If you're new to Mexican food I would recommend either the rolled tacos or California burrito (It's a southern California specialty that consists of a regular carne asada burrito with french fries in it). The guacamole is also pretty good compared to elsewhere I've tried.
If I was in California I probably would rate this place as just okay but in Pittsburgh this place is FREAKIN AWESOME! I'm glad I don't live nearby otherwise I'd be here every other day with an expanding waistline.
Don't let the exterior fool you. This is everything a taco shop should be: small, simple, cheap, good and fast.