Over the last year quite a lot of people have asked for Airbnb data sets on a number of cities. I finally wrote up how the data is collected, and some assessment of what is reliable and what is not. You can find it here (HTML and PDF) and under the Airbnb Resources menu of the web site.
Airbnb Data Collection Methods and Usefulness
Bookmark the permalink.
Thank you very much Tom for sharing all this information. This summary is very useful!