I don't really consider AirBnb an investment at al.. It's more a way to make some money on the side if you have spare rooms. If one really wants to go into the hospitality sector (which is not my case) there are better ways to make a profit out of it, such as you do your own marketing, you build your own website, etc.Not really a helpful comment without an explanation. Many people succeed where other people fail.
I have used AirBnb in the past. It gives the idea of something cheap and amateurish.
Plus the idea of having drunken tourists pissing and puking around my house puts me off big time.