I do adore San Andreas but I think San Fierro is one of the weakest areas. My metric for how accurate they are is a sense of "oh I've been here before" and I really only get that in a couple of spots, as compared to Las Venturas (Las Vegas) and Los Santos (Los Angeles) where I could actually go to the cities in real life and feel like I knew where I was going because I'd played San Andreas enough. Compared to those two, San Fierro feels like a Backrooms-style dreamlike compression of the real thing, where a lot of stuff has been moved around. But parts of Haight-Ashbury, Pac Heights, Nob/Russian Hill, Polk Gulch, Ocean Beach and so on are still fairly distinguishable and correctly arranged.