For example, the National Association of Realtors (NAR) reports that around 10% of home sales occur without being listed on the MLS.

Thanks in advance!

I say biased, because it seems fair and unbiased reporting is a thing of the past.  

This is one of their biggest advantages as they often bypass the personal liability and credit reporting of traditional loans.

Frank - Love this report!!!

A premium plan is also available with advanced features for $7.99 per month or $34.99 per year.

This is how the rental income is reported on their personal tax return."

However, the exact treatment may depend on your accounting method (cash vs. accrual basis), but most individual taxpayers use the cash method, meaning they typically report expenses when paid.

Quote from @Garrett Brown: I have had maybe 2 to 3 guests trying to check in early or "just go by and check the place out," which always scared me to give the information that far in advance.

These issues should have been ironed out in advance.