They are located in the back parking lot of a gas station.
Whenever I'm in Napa I try to stop here for lunch. The tacos are inexpensive and really good. I also like their super burritos. I always get the Asada.
The tacos are regular small "street" tacos always served with some grilled jalapeno. The burrito is a good size, not small and not too big. You don't feel cheated and you won't go hungry.
I've been going here since mid 2016 and as I said, I will always return when I'm in the area.
They are always busy but food comes out rather quickly. There's some tables and benches to sit and enjoy your food there if you want. They have plenty of parking.
Keep up the good work!