Comment by brabel

I have gone through a similar journey. In my case I believed the main problem was the neighbour next door. I got an extra layer of gypsum on the wall but turned out the noise comes from all sides. You can't win in such situation. Apartment buildings not built with noise isolation in mind should be illegal. Had to move out and went to live on a house that was absolutely silent. Well, as long as no one outside was mowing the lawn or something. Then, after 10 years, forgot the problem existed and decided to buy a new house near a busy road. What an idiot I am. Now going through all possibilities: already ordered an extra thick glass layer on my windows (it already has 3 layers), bought sound sound dampening panels (they do not do anything other than help a tiny amount with echo), sound dampening curtains (no effect, but at least stop the daylight well) and may even build a new fence and build glass walls around my balcony. But yeah, you can get used to traffic noise, I hear, and sound cancelling headphones solve the issue as long as I wear them (nearly all day anyway while I work)... it's getting better already after a couple of months. But stumping neighbours upstairs, your only defence really is headphones.