This eliminates double bookings and allows the cleaners to be aware of last minute bookings without a source constantly monitoring and updating. 

It's called the "Cycle Monitor".

The environmental controls are very tight and underground storage tank (UST) operators are held to strict standards for regular inspections and monitoring. 

Talked to a local investor today and he suggests staying closer to home so I can monitor rehab.  

Choose where you can very clearly describe what you expect, move by move even  the most detailed and above all else (even if you hired the controller): a way you can monitor what very specifically is getting done.   

I can't really complain about the 10% when the most "work" I'm doing is monitoring things from my phone.

I tend to acquire multifamily property in markets with a compelling growth story (of course the future is uncertain but it pays to begin in the right direction), improve the property to bump the income in the front side of the investment, then monitor for the optimal exit point.  

Monitor the results and tweak your message if needed. 

Do you charge for monitoring and maintaining vacant units?

I would suggest turning the water off to the toilets because if the flap needs to be replaced or it does not fall properly when someone stops by to check it can run up an enormous bill real quick.So that the house does not get broken into, maybe add a few light or music  timers and a simpisafe type alarm with monitoring.