About 90% of reviewers praise Fonda San Francisco for its unique, innovative takes on Mexican cuisine, calling dishes "amazing," "outrageous," "artistic," and "out of this world," with special recommendations for tacos de fideo, eggrolls of chicharrón, cacachuatados, shrimp, costillas, and barbacoa's tamal. Multiple visitors note that the experience is more like a culinary event than a standard restaurant, mentioning a vibrant, creative atmosphere, unique décor, and the involvement of Chef Herrera, whom several reviewers describe as legendary or iconic. Roughly 15% highlight the hidden, unassuming nature of the venue and affordable prices, with many suggesting ordering several small plates or the tasting menu. Downsides, cited by around 10%, include occasionally inconsistent service and some discomfort due to heat or casual ambiance, while one review notes the venue doesn’t accept credit cards.