My point in asking in the forum is because I'm not claiming to be an expert, but rather want to find experts that are interested in really assisting homeowners with this option that is not frequently (compared to traditional sales) mentioned.

I can extrapolate the references to understand the designations; however, I was wondering if there is a more formalized outline somewhere which highlights specifically the qualities/characteristics which categorize class A - C?

They should be based on the characteristics of the property.

Frequent pest control will also help.  

We frequently hear landlords say: “I never have an issue with the city.”

East Lansing doesn't like rentals and charges huge fees for registration/inspections, and they do them frequently.)

I am aware that STR's require a higher level of service and have frequent turnover.

I'm not saying that it's impossible but one should be realistic about the time it takes to self manage and start up from finding a handyman/maintenance, GOOD cleaners, listing description, professional photos, dynamic pricing, frequently doing the enemy method, channel/booking/auto response managers, business hours, business phone, generating return statements, hiring and training virtual assistants/co hosts (which will expect a fee anyway), background/criminal/credit checks, dealing with tenant questions/demands, reviews.

The roof is one of the major expenses and in Texas we get hit by hail frequently at least once per year.

Prior to doing this deal, whenever I'd analyze a deal and put together a pro-forma, I always allocated some expense for vacancy, frequently 8%.