If the house has been vacant for 15 years the electric system is the least of your worries.

The only way you'll know the extent is to hire a plumber to evaluate the entire system and be prepared to spend a pretty penny to bring it all up to speed.

Be sure to screen properly and use this as a lesson to improve your systems.

. :-) Same could be said when I was in CS, I was a systems engineer at the time.

Especially if it was listed on the same MLS system as the for sale property. 

You can upload your property to their system and they will call you if they want to place a family in your property. 

Maybe your system of keeping track of conversations you had with your tenants weren't that effective, but you can always try new systems until you find one that you can keep up with and works for you as well. 

Otherwise, the long term Tenant can claim that you are stealing their utilities for the Airbnb.You can do a RUBS system where you figure it by square foot, and divide the bills accordingly. 

And there is no appreciation rate in the world that would have me risk 18 months of the Ontario legislative system.

Here are the questions we asked (I think I got these from a David Greene book but I probably inserted some of my own so take it for what it's worth):What experience they have managing rentals personallyHow many doors their company managesHow long have they been in businessWhat they feel their company’s strengths are.How they collect rentWhat systems they have in place to make things efficientHow long they have worked for their current company.What is the monthly percentage of rent they’ll take?