I've stayed at 22 airbnb's 11 were fine. 11 had issues most with false advertising in some form or another. One listed the wrong location and if they had listed the correct location I would not have rented even though the room's interior matched. A few claimed to include onsite parking but didn't which of course is very inconvenient. The last one that did that claimed "Easy Street Parking" as AirBnb's blatant lie. I usually had to park a mile way or pay for a $25 a night garage a few blocks away. One claimed wifi but was actually just stealing it from the neighbors and it only worked in a corner of the apartment if lucky. Another who I asked if their heaters worked, because a previous one was cold, said yes but when I got their the heater was as loud as a vacuum cleaner and their wifi had a notices "don't use much as it will run out". This for a place I expected to get work done. AirBnb in Japan is full of listing claiming 2 or 3 bedrooms but that actually only have 1 and this isn't a cultural issue. Look at any J-apartment rental site and there is zero ambiguity about what 1, 2, and 3 bedrooms are.

It bugs me that YC appears to have absolutely no policy of conduct for the companies they fund. It's totally within their power to say in so many words "be evil and we'll pull your funding and report you to the authorities". IMO AirBnB is complicit in these issues. There is no punishment for bad listings and often AirBnB doesn't even have the options in their system to list them correctly. They even removed my review that included pictures of proof.