Late, but for posterity, I found the last Australian location. I couldn't for the life of me before, but it came up yesterday when I had another look.
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33C Anslow Street, Woodend, Victoria (archive is not working for me today, apologies).
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The house is not far from a train station, much like the other two locations identified. Very interesting how deeply his characters adventures seem to be thought out. I still highly doubt he travelled to Australia, but he certainly put in some effort coming up with Stefanie's shenanigans.