There are quite a few people who must be going after vacant or older people with free and clear titles.... 

Hi All-I want to research short-term rental (STR) opportunities in Snoqualmie Pass here just outside of Seattle. 

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My advice is do not let that stop you from refinancing and being able to free up 100% of your entitlement.

Come check it out please feel free to contact me if you have any questions.

In addition to what @William Simpson posted I would add the following platforms: - Roomies.com - Spareroom.com- Roomster.com Beware, as some of these are not free, but they can greatly complement the free ones already mentioned. 

An LLC is not free.

Another option that can potentially be free is looking for a mentor who is doing what you aspire to do in real estate and see how you can be of value to them so you can learn while helping their business.

I'm hoping to find a management company that works with traveling Nurses that require short term rentals.  

Pick places that are similar to what you are looking to buy.You can also head over to https://www.awning.com/airbnb-estimatorIt pulls the same data that AirBNB does and it is free.