I can't possibly say enough good things about Los Gemelos! Not only do they have a fantastic variety of authentic (topped with only cilantro and onion) tacos, but the prices are incredibly cheap.
My go-to meal is two campechano tacos and a side of beans. If you've never had these tacos before, you must try them! The filling is a mixture of spicy chorizo sausage with crispy steak pieces. They are so good that I can't help but crave them constantly. Steak tacos are also a great choice!
With its great choice of authentic Mexican dishes and low prices, Los Gemelos is an amazing choice whenever you are close to the downtown area!