There isn't a sustainability problem in Texas, it's a regulation problem.

What's the quality of the furniture included? 

When it comes to furniture/design it depends.

Looking for suggestions on any specific building materials, fixtures, accessories, furniture, and tech for a STR.  

I’m exploring a few options and would love to hear your thoughts on each:Airbnb Rentals: Is short-term rental still a profitable and sustainable option given current regulations?

And a SUSTAINABLE approach to rental property ownership. 

If you can get all the bedbug containing furniture out of the place and it will sit for awhile (or let it sit while the other repairs are done) you may be able to avoid some cost, but if you want to get a paying tenant in sooner rather than later you will want to bite the bullet and get it well done.

Easy living, comfortable furniture. Fully

This will be negative cash flow if using sustained maintenance /cap ex.

Then hire a handyman to put everything together.Rooms to go sells whole rooms full of furniture, sometimes at zero interest.