It would be nice if you had a contact who was an actual mason not a marketer.  1930's construction is rare so maybe they cut some corners it was a global depression.  

Although insulating the floor is a nice extra, it is not the primary way that cold gets into the house.

And if construction doesn't start up soon and return to precovid growth, you're going to see a nice gap that helps drive occupancies even a little further up until it does. 

There is a organization called Mirror Indy who, IMO, has written a couple of great articles about the IHA challenges.

Individualized container homes would be ill suited for assisted living style care.

Put down a nice piece of sheet vinyl.

For example, an ADU is nice for a rental, but not every home buyer wants to pay a premium for an ADU on their property.This would be case by case and property dependent.

It looks like a nice house but its next to a gas station & now it won't rent or the tenant is not a quality tenant since they are willing to live next door to a gas station.4 - If its sounds too good to be true or it seems too easy, run away very fast.

Considering where you live and that you have no written lease agreement a lawyer is really needed.

I have heard of cabin / mountain market STR operators doing some kind of hiking package, or way to connect a guest to a private tour guide for an "upcharge" which gives the hike tour guide an income and the STR operator a nice upcharge too.