Thermostat was off the wall, laundry room filled up to 3ft with dirty clothes trash everywhere, bed frames dissasembled and no water.

I've had kids tell me their heat is not working and they never turn on the thermostat, etc, etc.

s, your thermostat, lighting, security cameras, etc. 

(Keypad lock, thermostat, etc) I have ring at my own personal home, I know of another Host who uses Google Nest. 

Smart lock, smart thermostat, Ring doorbell or security camera that you can view remotely (make sure to disclose them on the platforms), Pricelabs for dynamic pricing.  

And you can tailor it to you, so 1) You certainly don't have to charge 100% while vacant (dependent on bldg. layout, thermostat access, etc.) and 2) You can tailor the Gas/Electric as you have brought up so maybe 50/50 all except 60 unit 1/40 unit 2 for electricity... etc. 

They have claimed their thermostat changes temperature (ex. they set it at 72 before bed and wake up and it's 65 degrees in the morning.) 

Bring a thermometer and measure the temperature separately from the thermostat to see if they exaggerated the issue.

Each apt has its own steam loop and thermostat, so they just installed run time meters on each apartment's steam valve and calculate the gas usage from that.

The benefit I see in ducted minisplits is they can use just one thermostat instead of a separate one in each duct.