Looks like Rboy Apps has officially released an updated version the Rental Lock Automater app (RLA)
I had been given a preview version some time ago and it's been awesome! I've set it to turn on the thermostats about an hour before the renters check in and turn then off at check out. Our last utility bill was down and I no longer have to manage my thermostats manually anymore :). That was the one thing that was missing earlier and RLA just does it all for me now. It schedules the renters, messages them their codes, activates/deactivates the codes, handles check in and check out (it even has a neat little option to turn on the porch lights if the renters check late in the evening) and also disarms the security when renters use their code to unlock the main door. Just make sure you have clear instructions in your text message and in the house for your renters.
Our next project is connecting our patio door to RLA using a keypad to lock/unlock it.
I'm just completely in love with RLA!
They don't send our mass mailers unfortunately so you need to follow their Facebook to get updates.
https://www.facebook.com/RBoySTApps