But the host got around this by putting beds in a sun room, using blow up mattresses, etc. 

For example, if you can prevent the nightmare tenant, you avoid--well-- nightmares (like real ones, where you lose sleep or wake up worried how the eviction will play out or toss and turn wondering if the non-paying tenants are trashing your place; you drift off imagining them doing nefarious things under dim lamps with bunson burners and beakers amid a pile of trash surrounded by half feral pit bulls resting on dirty mattresses)... 

First I got a box spring cover which you'll want to leave on and unopened for over a year, then I sprayed the earth all over, along baseboards, under furniture custions, under the mattress, on the mattress, everywhere.

I want to purchase several items (soaps, paper goods, additional towels, air mattresses, etc) for use by those who use the Airbnb.

I am helping to treat it but he accepted responsibility and discarded his mattresses and sofa.For the OP, I would refuse the tenant based on other reasons.

It could easily sleep 6-8 people with air mattresses. 

I believe she said she's never bought a brand new mattress, but don't take my word for it, listen to the podcast :)Never bought a new mattress??  

If you were going to be making a purchase in the next 3 years would you keep your money safely "under the mattress" in the bank, or would you place it in the market and accept the risk for the possibly great rewards?

My insurance covered a bioclean company to come and remediate the damage: That cleaning included deoderizing, removing affected flooring and removing and disposing a mattress.

Broken tile, leftover mattresses, etc.; you get the picture.I later learned when they moved they went on to purchase their own home and danged if they didn't advertise for room renters (and pets were allowed).