However, getting the house sold has taken a little while longer than we expected due to a survey requested by the buyer and surveyors in the area being booked up and unable to get to the house.

Even in those saturated markets, that'll put downward pressure on sale prices.Keep in mind that for single family, you will be competing against retail buyers.

I have a lot of friends and family in MA and it would be great to have an agent I can send my Approved buyers. 

Any good formats/tools out there that are good for analyzing the numbers on a potential single family home rental?

Hey Jean, no hard rule to this but with properties I've sold, I always think it's best to communicate with your tenants to get ahead of any potential issues.1) Potential buyers will likely need to walk the property, so you'll have to schedule with your tenants.2) They might see the house on Zillow, Redfin etc and think "Am I going to get kicked out?

3) Once Trump starts running the presidency from prison and there is nobody minding the store in the White House, if my buyers are caught partying in the Lincoln Bedroom, will they   3.a) Be arrested and charged with burglary?   

The hours working as a W-2 employee may potentially not count towards the hours requirement if you are not an above 5% owner...

Mortgage interest is (potentially) deductible as an itemized deduction on Schedule A only if it is secured by that given property. 

I ask because asking for vendor financing through 2 realtors (buyer and seller reps) is going to really put a damper on things.

If you are looking for active buyers in that area connect with @Mark Faustrum and @Joe Mueller!