It should be noted that this act doesn't define what a bedroom is, it only says that a room is available as sleeping accommodation if it's a type of room that's normally used as a bedroom or a living room. This would likely rule out larger kitchens with a bed in them but I'd be surprised if a living room/kitchen combo are ruled out given that studio flats with a combined bedroom/living room/kitchen are fine.
This act defines what should be counted as 'room' for overcrowding purposes.
Now courts are not stupid. In such cases 'bedroom' would take the meaning that is generally understood. A kitchen or living room with beds in them are not understood to be 'bedrooms' if you ask someone at random, and thus advertising "3 bedrooms" when in fact there is only one with beds in the kitchen and living room would most likely be deemed misleading and false advertising.
San Fransisco in general like in Craigslist and not AirBnB has plenty of listings of apartments where a dining room + living room where they added a flimsy partition to separate the two and advertise as a bedroom. I guess no one complains tho since you just choose not to rent since renting long term is usually a look before signing proposition where as AirBnB you pay before you go and it needs to be correct site unseen
I fully agree, if somebody is falsely advertising a 3 bedroom flat/house on AirBnB they'll lose the court case purely on advertising laws, I was just replying to the linked act since it doesn't really define what a bedroom is at all.