Even if the record owners have lost interest, due to relocation, drugs/alcohol, other disorders, incarceration or death, neighbors and community government people and secured creditor "people" care. 

So, if you (your tenant living in the tiny house) don't have a dog that bites neighbors, or mental disorder that has you getting into fist fights with your neighbors (either would invoke the "direct threat" exception to the Fair Housing Act), you can basically do WHATEVER THE HELL YOU WANT, as long as it's "reasonable" to the DISABILITY involved. 

If I had to choose metaphors, I would actually go with Bi-Polar vs Depression.

I probably have a little compulsive disorder of some kind, whatever I get into I just go at it 24/7, eat, sleep, walk and talk it, as a way of life.

I have to say, the heavy snorer may have a sleep disorder.

These people aren't zombies that are sobing and crying or have a disorder that will make them sell the house for less.

@Russell NaylorYou'll want to look into a couple of things...The Veterans Administration has a supportive housing initiative to promote housing veterans near where they get treatment for injuries and psychological disorders as a result of their service, or near public transit which can help them get to their sources of treatment.

One of the early things I learned is that hoarding is actually a phycological disorder.

Just over 9% of the population have a diagnosible personality disorder and many more, while not disordered to the point of a diagnosis, are just "difficult" people-- they have "entitlement issues" they will always be disappointed because no one ever gives them the respect they think they are due.

The apartment falling into disrepair is one thing, but hoarding is now recognized as a mental disorder and you don't want to be accused of discrimination.