My concern is more in the legalese of the deal.

I am a little concerned that they are newer, and also the wire thing someone mentioned.

In this way, I never need to be concerned about justifying my charge to their deposit because the damage is clear and obvious. 

Other advice, especially that pertaining to tax benefits, is also highly appreciated!

The other thing that concerns me is you mention that you are both high income earners but that you are “trying” to save an emergency fund.

While living with tenants can pose challenges like privacy concerns and tenant relations, clear boundaries, professional management, and proper tenant screening will help you succeed.

Slip and falls are a leading liability concern a property owner should be aware of and snow removal is not something to cheap out on. 

Would the 9-year balloon concern you, knowing you'd need to refinance or pay off the balance at potentially higher market rates in the future?

I also am very interested in purchasing more STRs, and this is a really low risk way to see if I'm up for it (we have a 2.9% interest rate on our mortgage).My biggest concern is an ongoing plumbing issue we have had.

They are more concerned with politics, and "feel good" topics, than actually doing their job...teaching their students how to learn.