The other thing that was a bigger challenge was the previous owner that lived in one unit smoked VERY heavily and that unit needed a very thorough cleaning, new carpet and new paint.

Don't use cheap faucets or door handlesSemi-gloss or satin paintsAvoid wood products on exterior (paver stones, trex decks), but if you don't, then use Grout and tile is caulked/sealed1 piece tub surrounds reduce maintenancecounter surfaces are solid and unbroken anti-freeze spigotslow maintenance landscapingInstall low flow water fixtures (toilets, faucets, cap off external stain wooden floors dark instead of covering with carpetsound-proof between units in MFUs in decrease turnover (possibly with dark carpets)quality deadbolt with key, quality handle without (prevents lockouts and makes lock changes easy)remove everything that can be clogged, hung on, broken, or injure a tenant (window blinds, ceiling fans, light fixtures with key chains, wall sconces, towel racks, glass doors, dishwashers, garbage disposals, gas stoves)

Can I refuse to show the property to a prospect who is a smoker and the property is non-smoking ( one of the qualification standards)?

I have a tenant who signed a no-smoking lease in Los Angeles.

A short-term rental shall have working fire extinguishers, smoke detectors, carbon monoxide detectors, and an exit plan.

Holy smokes!

you pay this insurance in case you cant make payments.. that is also fraudulent there is NO insurance for private loans does not exist.. so they just try to suck as much money out of you as they can.. then either go dark or come up with excuses why your deal cant fund.. to to Lendinghome .com and look at what a real lender charges. 

No smoking policy, not trash policy.

The very worst thing you can do is go dark on them.

I suspect the seller just goes dark..