OK, I am saying this kindly, but, my neighbours don't like me and I live in Spain. They think I am a recluse (which I am not) I just tell DD to keep the noise down, to take her shoes off, I do not SLAM THE DOOR instead of shutting it and I do not keep my 2year old up 'till 11pm.
Fireworks do not start going off at 3am in my ideal world.
Now I have lived in flats all over the world (including Rome) and I have never known noise like it!
My DH and DD when they speak to each other in Spanish SHOUT, my DH shouts at me all the time, he knows no other level, I have to constantly tell him to keep it down, I can't bear it (he is Spanish obvs)
It sounds like the neighbours are killing each other and they are discussing tortilla de patatas.
Honestly, it is a cultural thing and I am not saying you are like this, but it sound suspiciously like you are and you just have to realise it is a cultural thing.
You are a lot louder than you think. I mean this kindly. Just tone it down to British noise levels.