We had to call the Host on our way there, to realise that there were no rooms for us after our booking. The Host just told us that this was an 'airbnb mistake', and after asking him what we are supposed to do with three young kids, at the pick of the touristic season in the South of Crete, he suggested to just try to find something at a bigger village nearby.
Booking with airbnb at this residency is unreliable.