I found this weeded out a lot of undesirables.  

Most do not want to be in the hood or an undesirable area just like you and I don't.

This results in less rule breaking, less property damage and less undesireable behavior.Remember, it is like a chess game.

I prefer month to month as it's easier for me to get rid of undesirable tenants and I don't like keeping people hostage as renters when it's super easy for me to find a new tenants as I offer below market rents in a hot market in order to attract better tenant that will comply with my explicit instructions of "not to bug me unless its an emergency." 

On the positive side, all of the interior walls are concrete block which limits peripheral damage when shooting occur inside the buildings or tenants set their units on fire.

And it's helpful in preventing undesirable activities from occurring on your property. 

Public transportation for mid-class working people seems to be mostly undesired, making the last point not as important IMO.

I rent month to month because I like the flexibility it provides in terms of asking people to leave without having to prove that they did something wrong.....the downside of that is I end up getting houses back in November/December which always means I'm going to lose 1 1/2 to 2 months rent.not going to say finding a good tenant in a week is impossible, but in my experience I get inundated with the people who have a history of evictions and other undesirable activity during the 1st week the listing is up, followed by a wave of much better qualified prospects. 

Locations that one may call "undesirable" but the AirBnB was 100% booked almost all the time.

.: I read an interesting article not long ago considering how sort of "good intentions" lead to potentially bad/undesired results.