We don't hear anything from our neighbours
It depends a lot on your neighbours. Previous houses I have lived in
had old people,
and you never heard a peep. Until she got deaf that is, and the TV
could even be heard outside in the road.
The worst noise with halls together seems to be children running up and
down the stairs.
That really resonates through the structure. I have not lived in a
house with a cavity party wall. I suspect that would be better.
Simon.