Natural, organic elements are popular and moving away from heavy, dark wood, and farmhouse rustic style (thankfully). 

You chose to manage on your own to save 10% a year which sounds like a smart choice...until feces hits the rotating oscillator.

Account Closed AirBnB didn’t invent STRs, they just popularized it by flooding the sector with VC funding and modern design.

S-corps are not as popular as before thanks to tax reform of 2018.S-Corps do bring with them some additional compliance costs(Corporate formation, payroll tax returns, s-corp tax returns).If you go ahead with it - make sure the savings are greater than the additional costs/headaches.Speak to your CPA before proceeding.

Agent would be the best first choice as it's their profession and they'll be able to screen those people for you.

I ran and operated numerous short term rental properties successfully between 2007-2015 wayyy before Airbnb became so popular and everyone in every corner decided to do this as a form of extra income.

If mathematical, consider the interest rates when you make these choices. 

There are quite a few themes out there that you can use, the most popular I have seen is "Houzez" on themeforest, which costs around $60.

There is a lot of talk about the future of tourism during and post-COVID and how it will affect the behaviors and choices of vacationers. 

That's a very very specific and nuanced idea, and may not be a wise choice depending on your level of experience in real estate investing as a whole as well as short term rental or hotel experience.