I was burning the candle at both ends though, and to be honest, I was not that great of a salesperson either. 

As an aside, the worst stains on vinyl were made by red candle wax dripping on the floor.

Regular inspections should be part of your normal operating procedure to catch things before they get this bad.Some things to look for when a tenant's electricity turned off.... top of the list are the fire hazards: burning candles for light, using outdoor grills inside for cooking, burning wood for heat, getting electricity from neighbors via extension cords.  

And even from there, laying tile can be a ~$10/psf endeavor for cheap tiles to ~$100/psf for handmade clay tiles and labor.Now somewhat real numbers: we are currently in a about 3,300 rehab down to studs.  

You will be charge $150 for any type of flame including a candle.”

The tenants “teach” us over time by their behavior, which kind of restrictions should be added.For example... not only no smoking, but no BBQ grills on porch or deck or within 10 feet of any structure, no swimming pools or wading pools of any kind, no car maintenance on the property including oil changes, no vehicles of any kind may be on property with current license plate, if you allow pets... no vicious breeds, no trampolines, no fire pits, no use of indoor fireplaces, no candles; the list goes on and on.Bob CollettCollett Property Management

Hi BiggerPockets, I've been using a hand made Google Sheet to analyze properties.

Also, it might seem counter-intuitive, but don’t be tempted to overuse febreeze/air fresheners/candles/etc. when showing the home to prospective tenants.

Then they started to keep their belongings in the space, which I didn't mind at the beginning, but recently I see they leave dangerous items such as burning candles and a standing mirror without mounting.

It was handmade by the previous owner and I have no idea of it's value besides the fact that it was a gorgeous quirk that drew in STR renters.