I can't personally answer as I have never lived in the units but out the ones I have sold, none of the owners have ever complained about it.
As John said, if you are blasting music, yes I'm sure you can hear, but average everyday noise shouldn't come through. You can always ask the neighbors when you tour the area..
Ive included some listings here. There is another one that I will be putting on the market in the next month or so as well that is not on the list.