Pretty easy to monitor what other people on your same network are doing... 2) A person in the Wi-Fi can scan all devices connected to that Wi-Fi... this has now become common since there were a few prominent cases of creepy hosts with hidden cameras to spy on their guests (use a 3rd wi-fi if you want to hide other legitimate equipment for this reason to avoid misunderstanding — e.g. a doorbell camera pointed OUT of the property).  3) You can control the bandwidth of each network and keep it balanced 50/50... so if one guest is running 5 Netflix shows doesn’t impact the speed of the other

@Jeremy Chaser Numbers aside - looking only at what you listed as your concerns -Sub metering water is actually the easiest item out of the concerns listed - I did this last year on a 3 unit property - the meters record the usage and send it out via an internet hot spot device.

That is 12/2 house wire that probably fed some device outside.

And to those yawho's above who said you have to put in the work, that's just a load of crap and a copout, again I didn't pay 40k to be left to my own devices. 

Someone else's opinion:''Well, this person shouldn't have had any kind of weapons and bombs and other devices and it was illegal for him to have many of those things already.

He also recommended Nexia to manage all the smart devices, but I'd also look into Homebase.ai, which offers resident communication, payments, maintenance management and smart device control through their property management web platform and ios/android resident apps for 7$ per month per unit.

Avoid filling the kitchen with complicated devices like a simple coffee pot instead of a fancy espresso machine, a hand blender instead of a Tilt-head mixer with six attachments, or a  Crock-Pot instead of an Instapot that can be complicated or dangerous.As for sleeping arrangements, I recommend an "ideal" number of guests and a maximum.

When I was in the development mode way back the developers would buy the major devices and test function.

I have the spreadsheet that I created to run the numbers on prospective properties on an spreadsheet app for my mobile devices.

. -- no handicapping based on device used.BTW - I'm glad you think it'll be fun . . .