I've lived in my current building for almost a year. My partner doesn't live with me but she spends a lot of time here so we decorated it to suit our mood and made it a very comfortable and cosy zen space.
There are 3 other apartments in the building and when I moved in all other rooms were occupied. The tenant below me moved out soon after, but on his last night he and his girlfriend got drunkenly comatose and left their music playing until 5am, at which time I banged loudly on their door because I'd had enough after banging on the floor a couple of times. The tenant who moved in after him is hardly ever here but is very pleasant whenever I see her.
The other 2 tenants are on my floor. One of the young women (room 6) moved out a couple of months after due to college, and the other young woman had been here the longest and is still here. She's a little eccentric and clearly has OCD, hoarding and anxiety issues but she's harmless.
It took a long time to re-let room 6 but eventually we got a new tenant who seemed nice initially, but it became apparent very quickly that she had no respect for rules and no clue how to live considerately, so she smoked inside the building and drank heavily most nights filling the recycling bin with empty Stella cans. She clearly had a lot going on but couldn't/wouldn't stop the antisocial habits, and after being asked a few times I reported her to the letting agent. She moved out shortly after but didn't tell the letting agent and it was another 2 months before they noticed.
We now have a new tenant who seemed a little eccentric too, and within a week of moving in the hallways are cluttered with full boxes and the whole upper floor stinks of cannabis. 
I've contacted the letting agent again to let them know and ask them to get in contact, but asked them not to implicate me because I have to live in the same building as this guy while he's here and I can't be bothered with that on top as well.
The clutter is stressing me out and our other tenant who lives next door to him clearly isn't happy with the smell either, but is too timid to say anything.
Why can't people just follow rules? 
