In 2013 my SO and I bought a fairly large house (5 bed, 2 bath on .75 acres) and moved in together.  It's just the two of us, no kids; so in April 2014 when our friend (we'll call him K) was in a tough spot, we wrote up a rental agreement and K had 1 bedroom, the den down stairs, parking for 2 vehicles, full access to kitchen and laundry and the main bathroom was essentially his.  He was paying 60%-75% LESS than he would anywhere else in our town

K ended up being the tennant from hell.  Our property was being damaged by his carelessness and as a result, in addition to other rules/boundaries, we banned all alcohol from entering our house and/or property.

 

At the end of September 2015, as the temperature was starting to drop, my SO came home from work and told me that one of his co-workers, a man in his 70's who is a veteran (we'll call him R), needed a place to stay.  He had been sleeping on the outside on a friends porch... I didn't know R, I had never met him or even seen a picture of him.  I was hesitant BUT, I wholeheartedly trust my SO and know would never knowingly or willingly put me anywhere remotely close to being in harms way.  R moved in to the guest room on the second week of October while my SO and I were gone for the weekend.

R knew all about K before moving in.  He knew the rules and boundaries that were in place and why they were in place.  Upon moving in, R informed K that if he saw K disrespecting our rules and boundaries, he would tell both my SO and I.