Everyone is so quick to condemn Twiddy. What if the owner did this and Twiddy is the messenger. Did the house sell or is for sale?
I'm not taking up for the property manager necessarily, but based on past experiences of my own and with family members and friends, I'd say the likelihood that this was at the property owner's direction is about 99% unless there was a sudden catastrophic failure on the property within the last 48 hours (major plumbing/electrical/structural issue), or the previous tenants completely trashed the place.
This is another gripe I have about renting houses. Aside from having to reserve and pay months in advance or more, if anything happens to the property at the last minute, those who are next in line are sometimes out of luck, especially if it's peak season and finding a comparable place is next to impossible. A similar situation happened to a friend of ours a couple of years ago. The night before she and her family were supposed to leave, she got a call saying a water pipe had burst at the house they were planning to rent and it apparently flowed for a couple of days before it was discovered, resulting in enough damage that made it unrentable. Fortunately, the property manager was able to find them something else on short notice, but the larger the group the more of a challenge it becomes.