Rules of thumb for vacation rentals?

[David Gerber]

While I realize that rules of thumb like the 1% rule cannot replace proper due diligence and thorough analysis, they can help focus time/energy. Does anybody have any helpful rules of thumb that can be applied to a short term rental search? And to make it even more challenging, the area I’m targeting is coastal Maine, which is a highly seasonal market for vacation rentals. I’d have to pay a property manager too. Any advice appreciated.