hey there, just come across this, we live in a similar set up and upstairs makes one hell of a racket, and we do believe most of it is unintentional, walking about late at night when things are quiet elsewhere does create much more noise than walkin about during the day, walking about in shoes is also louder than when she wears her slippers, all these olld houses are full of creaks and groans and sometimes its very frustrating when you are trying to get to sleep and upstairs is merely wandering about to go use the loo/get a drink/ fuss about in the kitchen. People are cautious tho in approaching other people, when we tried to approach her she became rude and the noise levels doubled :( she has a friend come round at 7am with a dog and they throw a ball for it up and down the hallway, which is great fun for me as i dont get in from work till 4am and by that time have usually just managed to go to sleep ARRGHHH, anyway my point is that maybe they have been on the receiving end of some rudeness from previous tennants, i think you should approach them with softly softly, remind them that its up to you where you smoke and if this wakes thier son then apologise but explain that its your rights to smoke outside, i do think that they may be being a little oversensitive xx