I'm looking for a PM group that has a reasonable monthly rate, manages tenant selection well, addresses property issues with quality, and conscientiously and actively turns properties when vacant. 

Also, in our experience, 95+% of agents have no clue how to calculate ROI, Cash-on-Cash, Cap Rate, etc., so what are they really going to help an investor with?

It seems like you have a reasonable down payment available so offer them a reasonable interest rate. 

Take that amount, figure out the mortgage payment based on the interest rate. 

Not sure what the laws are in ME, but in Georgia a first position foreclosure will wipe out the 2nd position lien making them riskier which commands a higher interest rate percentage.

At least earn a fee for finding a great deal.

My mortgage payments are currently $2,841.40/month and my property management fees are 4% (I'm striking a deal with a property manager I trust so I'm super thankful for them giving me such a low rate).

What makes people prefer airbnb than hotel these days, especially the rate of hotels are relatively competitive (airbnb becomes more expensive than it used to be), i.e. is it still a viable business for the most part? 

The attorney fees would cost a lot more than the repair.This is why I tell landlords to stay away from arbitrage.

The units sold on the open market for about the same price as if they were Fee simple with separate land deed ownership.