My DH and I moved into our first ever home last month - the ground floor of a converted Edwardian house.
It turns out there is no sound insulation and the family upstairs are extremely loud. They don't talk - they shout. Almost all the time. They also stomp about and seem to be wearing shoes indoors which makes extra noise.
The family is a mum with two teenage children. Grandma comes over from Athens and is very sweet, doesn't speak a single word of English and speaks at us without pause in Greek 
I've written them a letter explaining politely that there is little sound insulation etc could they possibly please try to shout and stomp less? I also explained that my DH works nights/weekends etc and needs to be able to rest.
She knocked on the door shortly after said letter was left and was very defensive - no hello nice to properly meet you etc, just said firstly if you have a problem knock on my door (perhaps I should have done this but I hate confrontation and felt a letter as first step was okay). Then proceeded to tell me she's a single mum she can't make her children stop shouting the problem is the walls and ceiling and there's nothing she can do about it.
I made sympathetic responses and asked several more times nicely if she could just try to please be a little quieter we would really appreciate it. She didn't really agree to this. Our cat shot through my legs and ran up her stairs nosy bugger at that point which kind of broke the ice. We ended up on much friendlier terms - but the noise levels are not much better from them 
This morning DH got in from work at 1am and is back in work tonight. They were shouting and crashing around from about 0715 to 0800 
What's the next step? If I take it to their landlord I'm going to make enemies of them.