To be slightly more polite, as this seems like one of your first places… You absolutely want to keep a neutral third party involved.

In my building, some of us are paying half or a third what new tenants do, the manager has a clear financial incentive to remove as many old timers as possible (and has tried her best.) If the norm was that building managers patrol for noise etc, you could much more easily get into a “he said/she said” with someone who has the means and motivation to remove you. Having the norm be police means that the complaint has to be somewhat valid, not just “enough that the building manager can increase their income stream.”