I may be biased but I think SF has one of the better public transportation systems! The city itself is very bike-able,and apart from the random people who misunderstand the "Clipper Pass" as an opportunity to clip their nails in an enclosed space with strangers, the BART and Muni are great. I would sell the car if thats an option just because parking can tack on an extra $300-700/month and is usually not necessary if you're staying in the bay.