I want to preface this by stating that I have been using airbnb since it launched, and I have never left a negative review.
As for the Melbourne apartment, we were appauled by the blood stains and other bodily fluids on the blankets, especially considering there were no covers for them.
As for the rest of the apartment, it was rather worn and extremely tiny. The second bedroom looks as though it is meant to be an study, the bed is almost touching the walls on either side. Lending to that room being an study, the power points are behind the bed in the middle of the wall, so getting to them is a pain. I would not recommend staying in this property as a group of more than three. The listing led us to believe that there would be ample room for our party of five... Laughable. We could barely get around without bumping into one another.
The noise from adjacent apartments and the road was very loud in the "master" bedroom, which isn't the fault of the hosts, but is something to keep in mind.
There was one role of toilet paper in the apartment even though the hosts were aware of our four night stay with five people.
The apartment is in a great location with lovely views. Close to the city and Prahan.
I recognise the impact a bad review can have on a property and its owners, so I do not write this lightly.