We stopped by here for an after-workout meal, and I was immensely impressed. We had two lengua, one al pastor, one pescado, and one buche taco, along with some drinks and some of their homemade flan. Everything was absolutely delicious- exactly what I would have hoped for. They have roasted serranos if you want to add a little heat, and also some radishes if you need to cool your mouth down.
You really *have* to try their flan. It steals the show.
Seating is a bit of a problem, but not enough to dock a star- there just aren't enough tables, so you *might* have to sit outside... ah well, that's the price you pay for having great food in a small area!!!