She then got a message from the tenant yesterday that said: "I know the plumber came but we did not have hot water yesterday and again this morning.

A hot water heater might have a 6 or 12 year warranty, but you can expect it to last double the warranty.

They know the tenant base, median rents of different areas, how much to increase rent each year, ranges of repair costs (ex: tenant calls and says AC isn't working, no hot water, faucet is leaking, the HVAC system goes out).

Let's just get the property furnished, a hot tub installed, and start making some money!  

Also if you correctly read the laws in most of the states in the US and the federal statutes, creating systems as the one you are promoting would land you in the hot seat.

Utility bills can increase significantly if guests stay for months during hot summers or cold winters.

In these instances, you'd have to check things like flooring, plumbing for leaks, roof for leaks, hot water heater, and heating and air conditioning units. 

TenantCloud seems to be a hot topic, here is another posting about it.https://www.biggerpockets.com/...For 1 property I wouldn't even look at TC or any other software that charges a monthly fee.

Even with lot rent, the affordability of lot rent plus the home rental makes mobile home rentals a hot commodity.

After I gather my "list", I do a quick google search to see if the ones I'm really hot for are on the MLS already.