^^^SF is pretty expensive in general. You have neighborhoods where it's vibrant, lots of restaurants, bars, shops, young people and neighborhoods where you have a 30plus crowd that just wants a comfortable urban environment without sacrificing too much.
I live in the Mission District of SF. Been here for about a decade or longer. The Mission is pretty vibrant, mom and pop restaurants, high end restaurants, cool bars and lounges but it hasnt always been like that. It's cleaned up a lot but the Mission is still a rough neighborhood.
I used to live in the Richmond District for a while but that was completely different style in SF. Closer to the beach and the Golden Gate Park, lots of young families. A little more boring but way more safe. Cleaner, fresher, more single family homes than apartment buildings. After about two years of living there I moved back to the Mission. The weather was always overcast and a little more cold overall. Lots of microclimates in The City.
The apt in the Richmond District was 1600/mo. The one I have now in the Mission is 2k/mo.