Duluth is not a city on which I can comment, but I want to encourage you not to fear college rentals. Seems to me if you set down your guidelines/rules, meet all of the renters personally & if they know they are 1st to rent there from you I think you might be surprised at the respect you receive from the students. Brandon Turner says Be Firm But Fair, and this is a good model.
I would also encourage you to have a parent co-sign for each kid. That keeps them on their toes. Find a snow removal and lawn care person - figure out their fee and make sure it is covered by kid's rent. Raise it a bit if you must. Then you aren't 'on' the kids for taking care of the place and they wont get hurt on your property either.
Then when they move in give them a big Welcome Home bag of coffee - maybe some mugs from local coffee shop or UMD too (something that they will think of you fondly when using) and they will want to live up to showing you how mature they really are ;).
You might find this is a lucrative way to earn money in this college town.
These are just some thoughts.
~Lynel