Leaks have a  detrimental impact on the water consumption.  

And 3 weeks later when the alcohol wears off, and a heart shaped box of candy appears with apologies--he's back in the saddle.So she wants to control things and have him taken off, you have a contract with him also, what if he wants her taken off and booted to the curb.Cowboy references because  I like @Nathan G.'

Liability becomes a greater concern when you add alcohol or other substances to the equation -- a common occurrence when dealing with short-term renters.The reality is that many short-term rental guests have never owned their own property and as such, there is a risk they may lack a sense of responsibility and respect for your vacation home.

We also include Internet and "television" (along with a flatscreen television in each lounge/living room) in our offering and just bake it all into the rent.This does not mean that we do not monitor and endeavour to control resource consumption - we are always making improvements to the building envelope; have installed LED lighting; use low-flow plumbing fixtures; have programmable thermostats and our own building monitoring system.Our objective is to provide our student tenants with a quiet, healthy accommodations complete with all the needed amenities at a cost which is less than a residence room at the university itself.In that light, @Al Williamson is steering you in the right direction - provide them with amenities not at your cost, but at a cost less than they could procure the service themselves.

I should have written in my review of them that they were obnoxious, chain-smoking alcoholics…but wait I’m a Superhost, so I dont’ do that, because that would not have been in the spirit of the whole “Airbnb make a new friend” mantra.

No smoking, No Alcohol, No pets, They can set the rules. 

So in all our electric consumption is  relatively low.

They have done water studies where water consumption dropped as much as 60% when tenants are being billed back.  

The boiler may be new, but if your hydronic system has a leak in it, it will be making-up water and this  extra consumption would correspond with the heating season.Additionally, are the DHW lines insulated?  

Because, ya know, WORLD WAR and the consumption of such.