This is an amazing taco stand. They have potato, birria, and asadas (and more), but this is the place to get chicharron tacos. Usually they're not quite my thing, but they are delicious and not soggy. Also, they have lots of salsas. When the place is busy, you go to the caja and pay first then they take your ticket at the stand in numerical order.
The tacos here cost 12 pesos right now which isn't the cheapest tacos out there, but they are big and you get a hunk of panela to go with them.
This is on Vidrio and Argentina near Ninos Heroes and Enrique Diaz de Leon- not too far from the Ninos Heroes monument.