What property management software or tools would you recommend for tracking rent payments, leases, and maintenance requests?

Quote from @Erick Pena: A "good" rental property is one that covers all expenses (mortgage, taxes, insurance, maintenance, property management fees, and any other costs) and still leave a surplus (commonly referred to as cash flow).Calculate cash flow as: Cash Flow = Rental Income − Operating Expenses − DebtThere's much more to it, but that's the basic idea.

Well if you ran realistic conservative numbers for maintenance, capex, vacancy rates, rental income, etc then you don't really need cash flow do you?

Consider tenant stability, including consistent payments and maintenance of the TOH.

Your maintenance budget should be 10% * $24,000 = $2,400 Make the tenant happy!

@Bryce Jamison As long as the previous owner keeps up with the maintenance of the home and keeps it in good condition, I tend to favor older homes in established neighborhoods.

Dependable routine maintenance is a part of this property with a full time team on site at the villa. 

On average, you will spend 10% of your income on maintenance per year.

., Smyrna, Decatur, Marietta), new construction or turnkey rentals for lower maintenance, or small multifamily properties for stability.

It isn't having paid off properties that offers security, there are still taxes, insurance, maintenance and management involved.