I got a quote from proper insurance who cover Airbnb. $2k / year which is around 3x higher than my current homeowners. I find it hard to imagine they have much risk, especially with $10k deductible which would remove all but catastrophic claims and as ever they will depreciate, require receipts etc etc. They do however respond to email quickly.
Slice do do a daily rate which works out about the same. I use them when I sense risky guests and I'm not around to keep an eye. $50/ week. Have used them and very easy to set up. Have not claimed though.
I sense you can make more money offering Airbnb insurance than hosting Airbnb guests.