If the room smells strange or if you see stains or saggy walls or ceilings, have an inspector look for mold and leaks.Finding a good home inspectorLocked Doors and BlockadesAsk about any rooms that are "off limits" during your home tour, and arrange to see them later if you're interested in the house.

Her 20-ish year old son made a mess out of it with cigarette marks,holes punched in the drywall, scuffs on the walls, carpet stains, etc. 

You can clear out the smoke stain by washing everything down, including the cabinets and ceilings, and then running a reverse osmosis system.3.

We actually own and operate a high-end luxury home cleaning business.We hired professional cleaners upon move-out & also had the carpets professionally cleaned at 6 months living there and again upon move-out and used proper chemicals and a professional power washer to clean any oil stains from the driveway we may have caused with our old work vehicle.Our landlord charged us the following odd, ridiculous charges:$3.33 To empty out the ice from the freezer ice maker $1.08 To screw a lightbulb in the bathroom vanity$30.00 To remove a nice black metal paper towel holder we had put in the kitchen cabinet$6.67 To fill and paint a tiny minuscule hole barely visible to the naked eye in the kitchen pantry door$3.00 For a smoke detector battery$3.33 To remove a small piece of duct tape from a wall switch in the kitchen we had placed there because every time someone flipped the switch accidentally it would turn the dishwasher off.

I can always tell when they have beeen there as there are tobacco juice stains all over the carpets.

@Ryan SwanLuxury vinyl plank has become quite popular in recent years due to its resistance to water and staining.

(They could have used a chemical to wash the stone down but many of those chemicals stain concrete). 

Because there’s only so many complaints you can take about “a glove being left in the driveway” or the “wrong color mesh was used on the gate to prevent dogs from barking” or the old standby “driveway has stains/isn’t white enough.”

I never knew why it was a thing to put ugly carpet over hardwoods, but I've had the carpet ripped out in multiple of my units and had the hardwoods sanded, stained and refinished and they look AMAZING. 

Also, stains on couch cushions and the fabric on the dining room chairs that might not come out.