I haven't lived in a flat since 1982, two actually for very brief times. Apparently we live in an apartment and not a flat. Apparently there is a difference. In one flat I lived in, (Glenhuntly) I remember hearing the bloke neighbour using the toilet late at night. In the other, I remember the noise of the high heels on a timber floor as the lady of the house prepared to leave to go to work (Elwood).
But in East Malvern, Glen Iris, Burwood and Balaclava, the noise from neighbours was minimal. I expect we caused more with our renovations and dogs.
Here, I could complain about tram noise, car noise, illegally loud motor bikes but as you can see in the photo, there is no reason for complaining about noise from neighbours. It just doesn't happen with 300mm (12 inch) thick walls. Pity the internal walls aren't the same. At times you might feel you are on a film set.