Federal Laws Prohibit Discrimination of 7 Protected Classes, Massachusetts has added 8 more:-02.Always know more of the Rules/Laws/Regulations than ANY Tenant.

I’m wondering how I can protect myself if they somehow rack up the bills/ abuse the policy. 

So your saying select No Damage Protection and just submit an extra charge when it's warranted? 

Requiring occupant to have renters insurance is another possibility for extra protection.

@Ryan Daniel  I will preface this with the fact that I have a legal background, specifically with estate planning and asset protection in relation to real estate investments.

A good PM should protect your interests and anticipate potential risks like this.Let me know how it all shakes out!

So, if you have 10 units and you are going to pay $1,500 a month and you are working on an active income job, too, this is an easy switch due to the labor mentally and physically (even if it is just phone calls) to get these rentals running as a well-oiled machine.  

You need to send the HVAC tech out to protect your investment. 

To protect yourself, make sure you have a great property for STR. 

When I had to switch Property Management companies, they suggested that I do include pets in my rental listing.