Furnish all the bedrooms (Craigslist $100-300 per bed with preowned mattress, buy $10-20 mattress cover, $10 lamp, $50 dresser or nightstand) and provide the kitchens with basic supplies (Walmart $20 4 piece set, $10 silverware, maybe some pots or not, can buy 1 multipiece set and split it between your units)Install Schlage Camelot electronic Door Code locks on the door ($100 Amazon-no lockouts) or a lockbox ($25) with backup keysPost on Nextdoor and Craigslist looking for a “house Mom” / Cleaner who will clean units between guests for $20/turnover.

The reason you get a mortgage is either because you haven't got enough money, or you have better things to do with the money, like buying more properties, or, if you sleep better knowing you have liquid cash reserves, stuffing it in your mattress (not really, in your mattress, but you know what I mean).What if, instead of buying for cash and gaining 10K equity when the house appreciates from 100K to 110K, you buy four houses with mortgages and you gain 40K equity when each appreciates from 100K to 110K.Of course, the inverse, is true. 

Two urine soaked mattresses, a destroyed couch, hopelessly soiled rugs and towels, broken plates, furniture, etc, etc.Between the damage and the lost income we’re out about $6k, not enough to file an insurance claim and make it worth the possible rate increase after the deductible.

I wanted to best utilize that money so I gutted the house to the studs while living without a kitchen or an upstairs bathroom for a while, sleeping on nothing but a mattress on a dusty floor.

There are mattresses and some canned goods in the property, so it seems like they have made themselves comfortable.

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)... 

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.