I call bushit on this story. This article is greatly exaggerated to grab your attention.
$1.4k for a closet in an Airbnb with 13 people, where you don't get a key and have to sneak in? Heh.
I have found a large room in a newer complex through a company pairing roommates in just a few days. It was $1800. Heck, you could pay $1k for a room in Berkely or Oakland and commute in by Bart.