Some good friend's recommended this place to me recently. Not sure they actually serve Chihuahua on the menu(!) but what we did have was great and left me wanting to go back the following week for more but alas this branch was closed for refurbishment. Luckily we found another branch on Valencia Street so I got to enjoy a 2nd delicious Burrito before flying back to London last week. Wish they would open one in London... Good clean, tasty food at a very reasonable cost. A must visit if you are in San Francisco and love Mexican food. They offer a takeaway option too.