RE: Rental income and loans … Last time I checked (a couple years ago), the lender used 75% of my gross rent as income for loan qualification purposes. Presumably this accounts for vacancies, maintenance, prop mgmt, etc.
In my experience for single family homes (I’ve had two rentals and still hold one) this is in the ballpark. You should expect to spend 25-30% of gross rents on PM, maintenance, repairs, etc. If there is deferred maintenance this will be higher.