We found out about the double book after driving for 8 hours. We had the code, we open the door, and the house was dirty and occupied. Thankfully the person wasn't there, or else he might have thought that we were trying to rob the place.
The lady/host talked to my wife and made a joke out of it... not funny. Since we were upset by this issue and they didn't want us to give them a bad review, they gave the house to the family scheduled to come at 4:30 or 5PM that same day. Yes, 3 different bookings
Learn from us and stay away from this property.
We ended up staying in a hotel.