- Personal incentives for fraud (i.e. people having their friends "stay" without paying and leave a good review so that the host gets some sort of incentive).
- We can only see data regarding guests in the US. Guests may have reviews for listings outside the US, but we don't have that information.
- Scraped data. Certain features aren't in earlier datasets, datasets only date back to January 2015 and are scraped once per month for most months.