I found out the hard way that Airbnb does not post negative reviews. I had a horrible experience in Almaden California where my coworker and I had an Airbnb for two weeks.
The place had roaches. There were noisy construction workers that got up at 4:00 AM and tromped on wooden floors waking us every morning. There were disgusting cigarette butts, construction materials and litter outside the unit – all these items were not reflected in the photos.
The host was also hostile. Not only did she not respond to problems but she refused to do anything about them or even communicate. It was a horrible experience and when I posted the information it never appeared on Airbnb. This is fraud and highly unfair to potential guests.