Please don't be fooled by listings like this. As they say, if it sounds too good to be true then it is. There are many studios in San Francisco but whenever I do a search for someone, the least expensive one in this town will be somewhere around $1,000 to $1,200 and up and that would be considered a good price for our location and the current market.
I have a couple of leasing agencies I can refer you to if you'd like. If so, contact me directly at 415-562-6999.
Good luck with your search!