[Johnny555]

I found San Francisco to be very walkable, with good (not great) transit. I lived there for over 15 years without a car. I commuted for 5 years from Russian Hill to what is now Mission Bay -- walked 10 minutes to catch the 30/45 bus which dropped me off a few blocks from work. I could walk it in about 45 minutes.

When I lived in the Sunset, I took the train, and that was worse than the bus - overcrowded trains meant that they sometimes skipped stops. So I usually biked instead.

The city is just not that big, most places are within walking distance if you're not going to/from far-flung areas of the city -- you can walk from the Marina to the Financial District in under an hour. (but the 30X made it a tolerable commute, usually under 30 minutes)