Where is the best place to live in San Francisco for a family on a budget?

My wife and I and our newborn are moving to the Bay Area. We know it’s expensive as can be but unfortunately we’re on a budget as we’re starting a new business (again). What’s the best place to live for us?

We like eating out (doesn’t have to be fancy), walking, having dinner and drinks outside and we would like a nice big book store not too far away as well as things and people to look at. The area has got to be safe and not too far to drive into SF. Please help! All ideas are welcome