San Francisco's MUNI has the problems of most large urban public transport systems (it can be a bit slow, it's not perfectly reliable, every now and then they'l

San Francisco's MUNI has the problems of most large urban public transport systems (it can be a bit slow, it's not perfectly reliable, every now and then they'll be some crazy person ranting to no-one in particular), but it's OK; half an hour and two buses (or a train and a bus) will get you most places in the city. San Francisco's also pretty small - about seven miles square - so yes, it's pretty easy to get around in the city itself without a car. Of course, this only applies if you're working for one of those hipster Web 2.0 companies that are actually based in San Francisco itself - if you need to get around Silicon Valley, you'ld almost certainly need a car.