If you're looking for affordable housing, it would probably be wise to look anywhere other than SF:

http://www.businessinsider.com/san-francisco-is-more-expensi...

The East Bay is only a 45 min BART ride away from downtown, and considerably cheaper.

Only coming from personal experience, that $1737 number for a 1bed in Chicago is very high and makes me question the rest of their numbers.

Currently living in Seattle and their numbers seem pretty spot on anecdotally for what people are paying now, though a few of my friends are looking and they have found nothing under $2500 for a 2 bedroom. Seattle I think is going to be a city to watch closely the next few years for similar types of housing strife we see in SF. Once all the Amazon construction is complete it's going to get awfully crowded awfully fast.