(not including the mortgage payment)Am I misunderstanding something?...

Here is the condo:http://www.zillow.com/homedetails/1761-Red-Jacket-Dr-Antioch-TN-37013/108741488_zpid/Rent comps for 2 bedrooms in the complex are anywhere from 1200-1300, but I couldn't find any rental comps for a 3 bed.

This property is a bit of a unicorn in the market and location as far as fitting the bill on exactly what my parents are looking for in a rural property,  including a second dwelling.  

Yes, your rate of interest will be affected as now you will have to include Mortgage insurance. 

General thoughts and questions I have include:1. 

Should cost around $500 and includes a rescope.

We are talking all real estate; including people retiring, like the one that sell their homes and buys another in Florida.

There is a cleaning fee included that pays for the house cleaning.I use a lock box for the key.I have wifi thermostats so I can save on the electric bill when no one is there.

In Ontario (Ottawa) people with student rentals, do you include all utilities (heat / hydro / water) in the cost for students, or do the students pay the utilities on their own (split the costs between them)?

In Maryland those include, Taxes, Front foot assessments, water bills, ground rent and other less common ones.