Sweeten the pot with a refund of 1-2 weeks of rent if they get out faster.Whatever you do, get rid of them.

Only appropriate potted plants and other outdoor furniture are permitted on patios and balconies.

Unless they are growing pot in the house (ie a grow op), you shouldn't need to do much. 

Personally what I prefer to do is to establish a substantial "doomsday pool" for vacancy, repair, and cap ex that I fund by taking the cash flow and putting it directly in that pot.

I also Airbnb a private room at about $1200 net. I

Gross in one thing, Net is another. 

You can sweeten the pot by telling them you'll refund the deposit within 24 hours as long as there's no damage to the property, or something to that effect.

We used tax returns, saved the part above the last rank when we got promoted, and career bonus we got...it all went into the pot for the next down payment. 

Probably a heavy pot.

Fifty gallon concrete pots with agave/ bouganvilla/ thorny hawthorn/ firethorn/ thorny simlax (invasive maybe not allowed in your location) cactus/ corona de maria/ blackberry/ big spikey plants with a sign that says you are filming anyone who trespasses on the lanai and is being broadcast on youtube.