To be safe with anything except a fairly new house, you’d really need to excavate around the house, parge the outside of the foundation with an asphalt/tar product, install a dimpled plastic membrane over that, and then on the inside, fastidiously install rigid foam on the floor and walls, spray foam/tape all seams, etc… Then frame, then drywall.Seems ungodly expensive.

Stacking plastic makes me sick to my stomach.

The trouble is finding them.This really isn't rocket surgery though. 

my classic was the tenant complaining of mold around the windows.. go and check it out and they haveand they have ruined the blinds and put up foil and plastic and so you had all this moisture  and when the mold started they were scrubbing it and ended up ruining the sheet rock try to rub the mold out..  

@Connie Stainbrook not only do we have hangers in all closets - they are actual wood hangers (I hate the plastic ones).

If just yours are gone and others remain, it's being done by your competition.Full disclosure, in my area if I see one of those cheap plastic signs that says "We Buy Houses" on it, it is HISTORY

Our family Tax Account is recovering from major surgery.

You don't need to allow "exploratory surgery" to occur in your unit while they make it a cheap and more convenient date for the upstairs' owner. 

Perhaps I was the exception.My nephew was attacked by his neighbor's pit bull and required major surgery.

I just use little plastic tags.There are "landlord" locks available online that allow master keys, individual keys and easy changes.