Hey David! This is a common strategy investors use known as Arbitrage. I have not personally let a third party run an Airbnb in my properties. But I do have two properties that I operate as Airbnbs. Here's my take on what you're sorting through. On your end, I think it is a great opportunity. As you said, it gives you the ability to see how it will work on your property without taking any of the risk, especially if they are signing a year-long lease.
We generally clean our units between 2 and 3 times a week. In my experience, our properties stay cleaner and better maintained than they do with an LTR tenant. It is important for STR operators to make sure that the property is in prime shape - landscaping, dust, dirt, lightbulbs, etc. If something breaks or is not up to snuff, it hurts their reviews, and in turn, can hurt their revenue.
If you were operating it yourself, I would recommend making sure you are up to date on any of the regulations in STR in your city. Since you are leasing to the operator, you would want to make sure that they are liable for damages and/or injuries on your property. I would make sure that you would be covered under your insurance as well just to be safe.