SPOA is an organization that I support. https://www.spoa.com/ Now I am very very careful when selecting tenants. 

That’s why improving your Click-Through Rate (CTR) is one critical metric to focus on to boost your Airbnb profit and visibility.The key to improving your CTR?

What would you consider a good minimum profit margin?

If it's a good rental and you don't need to sell, sit tight but if you can sell at a profit and reinvest into a better property I would suggest that. 

Maybe that is gross profit when you sell it, but what about the cost to build it?  

Sounds like you found a profitable niche 

Petersburg area, resulting in highly–profitable investments.If you need professional and courteous property management experts for your multifamily, single family, condominiums or town home, you've found the right company!

Contrary to most business lending, the REI industry has a lot of "non-bank" lenders that provide attractive loans that can lower your cost of capital and improve your profit/cash flow. 

A tidy, well-organized space can help the appraiser focus on the home's features rather than distractions.Research Comparable Properties: Have a list of comparable properties (comps) that have sold recently in your area.

When you charge under market rent, the IRS deems that you do not have a profit motive and, therefore, disallows all rental expenses.