daninpcb, always always always insist that your traveler signs a rental agreement, one that you create SPECIFICALLY for their stay, BEFORE you give them access to your condo.
And be sure to include all of your rules, with places to initial said rules. This way the traveler has NO confusion about the rules they are required to adhere to.
I've had a number of bookings via Expedia. I'm not a fan of the fact that the info listed on Expedia is inconsistent with what is actually true on my VRBO site, but I've not had an issue with the bookings, nor the travelers. Once you get ANY booking, from any source, it's entirely up to the OWNER to take charge of what happens after... call the guest, familiarize yourself with them, send them a rental agreement, make sure they sign and initial and send back, etc.