Middle of city, shovel ready with electric/water/sewer/roads/entrances, etc. 

Tough, water tight, easy to stack...Seems like an ideal way to create a neat place.

We have installed a permitted tiny house on the land, water meter. electric meter (that can accommodate a large house), and a 5 bedroom septic.

You can strike Gold or be dead in the water.

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.

Repairing water damage and fixing broken items is the bear minimum for a landlord.

If you have class C rentals, I like to use Traffic master Grip Strip Water Resistant Luxury Vinyl Plank Flooring.

This means, no electricity and no water as the well can't pump - which also translates to you get one more flush on each toilet and then you are done.  

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).

To manage this, find the average electricity, water, and gas usage in your area.