In your position, I would take the offer. You get to move from Missouri to one of the world's best cities. SF is one of two cities in America with 24/7 public transportation. Weed is legal, which reflects the extremely socially liberal feel of the city. SF has an actual music scene.

.16% of the company is low. You can try and get more, of course, but the offer as it stands is a great way for you to relocate to SF. If you don't fall in love with this company, you can always find a better job with a different company.

$60,000 is low for an uber-hacker in SF but it's plenty to live, especially when you're relatively young. Get a roommate if you want to live in a decent place in a safe part of town, otherwise, the less safe or more boring parts of town are cheaper. I'm trying to find a place on Craigslist now for an upcoming move to SF... right now I'm looking in the Castro, Mission, and Noe Valley areas. However, few places are available in advance on Craigslist. I think the way it actually works is the place is listed on Craigslist, you go to the open house the next day and beg the landlord to take your deposit, and maybe you can get the place. Things are not nearly as tight outside of SF proper, but there is a reason SF housing is in such high demand.

This is a good overview of SF neighborhoods. http://www.dreamworld.org/sfguide/Neighborhoods/index.html