I understand it only takes a few bad apples to ruin the entire industry, but most of the time the grass is not greener on the other side.  

They can include a judgment in their bankruptcy, but they can never get rid of an eviction in a database used to report evictions on an eviction report.So, they may get the last laugh in free rent, but you can get the last laugh regarding ruining their ability to rent from any reputable landlord forever.And, why the HELL did your manager rent to these people? 

A bad one is like a cancer you have to get rid of.

Your only real leverage with any tenant to behave, is the threat of kicking them out, and ruining their credit.I did not accept co-signers, because especially with students, then you are dealing with a helicopter parent. 

Your tenants don't get to steal or ruin your things. 

You better educate yourself quickly because one little mistake can ruin you.

After all, an extended family living for free in a large house sort of indicates they might have financial woes.Congratulations on the equity you inherited with this deal, but don't allow conjecture to ruin this for you. 

Before you get the police involved think about whether you want to potentially ruin someone's life over doing a recreational drug in the privacy of his own home.

They will probably ruin parts of the home so account for this.

Cheap laminate + accident = ruined laminate.