The research, vetting tenants, property management, repairs already done, etc. is attractive to a 1st time Rental investor. 

For one, they'll attract better quality tenants, which makes vacancies, tenant turns, servicing your debt a lot more likely and less variance to when you go to lower or middle class tenants.

Is there a specific town or suburb that would attract medical professional and/or professional tenants more than others?

I would also have thought they would have attracted only the most conservative investor whose primary goal was protection of principal not how do I get the highest IRR ..  

These options allow them to control expenses better, attract similar tenants, and often achieve higher rents with lower costs.I believe there is a promising market for purpose-built attached single-family homes for rent in Worcester.

This attracts higher quality, mid to long-term tenants who often take better care of their living space.#3 Higher Rent Potential:ADUs offer an additional income stream, allowing investors to charge higher rents overall.

Judgments against an LLC with the property that is secured by a mortgage of 80% or more are not likely to attract ambulance chasers.  

I know it's been somewhat economically depressed, but I see some attractive properties for sale would love to hear from anyone that has invested in that area before.

The area attracts many vacationers during the summer months, and if you are able to get some winter renters from Oct - March its a win/win.

That's why calling is so attractive.