Older home have the potential for higher repair costs due to outdated electrical, plumbing, etc, but as long as there's no moisture issues these houses were built 10x better than today's houses.

The tenant did keep windows open and run a portable ac in that room to try and dehumidify and get rid of excess moisture but didn't make a difference. all of this is a long winded way of asking:1.

The ozone will not penetrate the drywall, however, if you have mold between the drywall you have oxygen getting in the wall through crackes.

When the rains came this allowed moisture to come in from the crawlspace thus affecting the living space with some mold especially that time of year (summer).

Being that it’s vinyl backed is protects the subfloor from a certain amount of moisture and there actually isn’t very much carpet so it’s fairly easy to clean.You could try commercial flooring stores and see what deals they have left overs from bigger jobs.All the best with your project

Red wine stains, cutting directly on the countertop, moisture issues, etc.

By the time you notice the roof leaking, good chance is there has been slow water penetration already.

Moisture is trapped in the wall which can create mildew/mold issues inside plus it decomposes the brick itself, and rather quickly too.

And the more freeloaders that penetrate our Southern border the worse it will get.

So when they installed your tile with wet mud, the slab has drawn that moisture out causing it to shrink and crack.