Your problem is with the tennants, not the landlord.
If you have a problem with them, stop being a pussy and go talk to them.
What's the land lord supposed to do, tell them to stop annoying you?
I hate when neighbours phone me and complain like bitchy little kids that my tennant is playing music at 2pm on a Saturday afternoon. Either go talk to the tennant, or phone the police. Not the landlord's problem.
Landlords will often appreciate this information as most of them want good, law-abiding tenants.
As for late night parties, call the police if it is keeping you awake. If they can be self-centred and inconsiderate, you can be self-centred and snitchy.
^ as stated, talked to the tenants, no dice. It's not music at 2pm, its all night drugged out parties. I've gone over at 5am in my boxers. So don't really think calling me a pussy is fair.
I believe that putting 7 individuals into the house will count and should count as a violation to Toronto's rooming house by-law (thanks for the link) so now it will be the landlords problem. I also think that making contact with the landlord makes sense to get a read on the situation. They are destroying his property.