I would stay away unless you find a good reliable reference  that has personally used them with success.

Comparing that to 30 year fixed at 4.25%.

What % returns will the rental property bring in, and compare that to what you are paying out on the mortgage.

Can you link to AIRBNB comparables and how you calculated your vacancy percentage and estimated income?

My current very reliable tenants have hinted that they will be moving out when their lease ends in March of this year.

I thought of rent-to-own is an attractive option as opposed to seller-financing because of the monthly rent being tax advantaged compared to collecting interest with seller-financing, and also thought that with rent to own you avoid the risk of foreclosure because tenants do not own the property.

I'm looking at lists for obtaining properties such as myhousedeals.com and Happy Home Investor, etc and more confused every day as to having one reliable source. 

Point Breeze is one of the areas that these renters are moving to for it's relative affordability when compared to places in center city yet still within walking distance of center city.

You could compare their bill from same time last year and pay the difference.

The first time I walked through properties I knew absolutely nothing about them compared to what I know now so having someone that can point out potential flaws and things to worry about can be very helpful.