I'd look into Airbnb since that's their primary function.
If you live in a vacation spot, there might be real estate agencies who deal with this as well. My college town was a sleepy little town from October-May, but it had several major attractions during the summer that more than tripled the population in the summer. Back before the days of Airbnb, one of my professors worked with an agent and rented his house for 10 days for $10,000 (not a fancy home either - sounds similar to yours). They went on vacation for about a week and then stayed with family that was about an hour away or the remaining days. They were a frugal family by nature, so the agent recommended a few 'upgrades,' such as cable, higher quality guest sheets and towels, etc. Check and see if there's an expert in your area. They'd probably know all about liability as well.