I watched a video/podcast once that showed a tool/site which allowed you to see what amenities the most offered amenities were in any given market/area ranked from highest to least (like A/C, pool, grill, etc).

If Airbnb is an option for your spare bedroom then that's great, personally when I first started I didn't want to have to deal with the in and outs of people and also making my place aesthetic enough that it would rank well on Airbnb so I went straight to long term rentals but if you want to dip your toe in the water it could be a good option if shorter term tenants make you more comfortable. 

While buying someone else's position at a potential discount is great, I would rank this endeavor as a magnitude of difference harder than making an initial investment.  

Your rankings are going to take time to build as you only have 2 reviews and don’t get the listing rating until 3 reviews.

Austin was recently deemed one of the top "boomtowns" in the country based on a study by CoWorking Cafe ranking America's "boomtowns" based on population growth, GDP, employment rates, and other economic factorsFort Worth came in at No. 2 with 64 points, beating Austin in the report's ranking of top cities with a 500,000+ population.

https://www.bizjournals.com/albuquerque/news/2019/08/05/nm-city-ranked-one-of-the-best-places-to-flip.htmlI've always got my eye on the next deal of which there are more than I can handle on my own. 

It scrapes your lists using data points from the entire history of past transactions and ranks properties by their likelihood to sell.https://www.dataflik.com/ 

If you're interested in the crowdfunding route, the top ranked sites that focus mostly on hard money loans are: Patch of Land, Peerstreet & Peerrealty.

Rank of the top 50 most dangerous US cities.Operating costs.

Or let them have it, it will boost your position in the rank of buyers...It's all just a game, do what is best for you.