When we were first in Oz, we had a 3 month rental. It was great for us as it was central to the city and gave us the time to work out where we wanted to base ourselves. It was let through an estate agent, so we paid the usual bond etc and as it was empty, we had somewhere for our container load of furniture. We were responsible for maintaining the garden. We left it in the same state we rented it in, and had our entire bond returned.
I think there is definitely a market for this length rental, and if a good rental agent is used, you would be unlucky to have any major issues.
Might be feasible as apart form anything else there is a 9 metre x 5 metre shed that would take a huge amount of furniture will give that some thought