James post is pretty solid. I believe in MN managing for other for a fee requires a license. I hear what people are saying with the term "host," however, all in all, its the same. It's managing a property, whether short or long term.
This is a risk question, because you could be exposing your self. To do it right imo, you could get your license and hang it with a low cost broker. So now you're paying $2500ish to become licensed and in a brokerage. Then just doing management activities. I think this covers your basis and also provides you EO coverage depending on your broker, but that's pretty cheap too, maybe around 1500.
So all in you're looking at 4k to run a biz in an ethical manner. Not much. You can also advertise that as you grow the properties you host, licensed/insured professional will be appealing to many of your owners.
Plus having the broker behind your back will give you decades of real estate law experience you can call when needed. I would interview and network to find a low cost brokerage that has experience in management or STRs.