El Toro Taqueria is a very popular place with the locals. Their food is freshly made, tastes good, and is reasonably priced. This is a no-nonsense, clean place to eat. You queue up in line, see what you would like to order, and they then assemble your order. Then you pay for the food and find a place to sit and eat or take it out.
Take BART to the 16th St./Mission St. station
Take Muni nos. 14, 26, or 33