I know it's just starting, but have you looked into any integration with HOUFY as far as pushing pics, descriptions, etc..? It looks promising.
You can import rates into Houfy with the spreadsheet
As far as listing goes, Houfy can import your HA or AIRBNb listing
I know this thread is a couple years old now, but I'd love to see an integration come together here!
There's not much demand for integration with HOUFY that would justify a full API. You can however import and export the calendars:
Plus one vote for Houfy integration. They're growing and getting more and more bookings.