Some family members are wanting to spend a couple of months including the coming Christmas, in a particular place in Germany while one of them does some doctoral research. I suggested to them that they should consider house swapping to reduce the costs.
I figured that offering a Sydney house in summer for a couple of months might well be attractive to some people!
They have launched into the process of organising it, and currently have two families/groups interested in swapping with them.
Yesterday I found this article in the Sydney Morning Herald, about house swapping and thought I should mention house-swapping as a low-cost way of obtaining accommodation while travelling with the family.
It could work for you!