Ask HN: Where to stay in San Francisco?

hi everyone, first post here so please be nice. just got an interview for YCS10, we're flying in from London and don't know where to stay in San Fran :( Need somewhere for 2 guys where we can spend the time working, ideally v cheap, and obv with wifi. Any and all ideas very much appreciated... (and yes, we know about Airbnb, what we don't know is where in the city to be)