The last town I lived in (in hindsight, probably too small to live in :/) many of the traveling nurses and other non-resident staff were supplied by a third party company.

In addition, for every repair and purchase of supplies (such as water heater), I always ask for scan copy of receipts, so at least you know he brought a water heater from a legit store. 

I use: Owner is not responsible for items damaged by the failure of the appliances or the supply of water/gas/power to those appliances, including but not limited to the loss of food.

The problem is that there are no limits on how many short-term rentals a single property owner can operate, he said.In some Arizona cities, Drennon said, “bad actors” are buying and converting entire apartment buildings into Airbnb rentals, effectively creating hotels in residential areas and depleting local supplies of rental housing.By contrast, traditional hotels typically operate in commercial areas that have much higher property tax rates.Many cities around the world — from Paris to New York City and even Airbnb’s home city of San Francisco — have laws that limit short-term rentals to protect the hotel industry and residential neighborhoods.

If you connect with investor freindly agent I'm sure they'll be happy to supply with the data.  

Prices are always going to be determined by supply and demand and as you continue to have a growing population and good paying jobs coming to town, that only helps the case for prices to go up.

I once traded a 19' Fishing boat that I took in trade for a down payment on a house and traded it for supplies.

You say to hook the garden hose to the "washer hookup on the house" but that's a water supply line, meaning water comes out of it.

I think all I did was procurement of supplies and installed 1 dishwasher. 

(Supply is also going up, but not fast enough to stop the rate of rental increase.)