"Oh well actually it's pretty reasonable for the landlord to take your money and sign documents and then afterwards surprise you with a rule you would have never agreed to saying you're never allowed to open your window"
This is not a conversation I will entertain no matter how favorably it is framed in favor of the person breaking several laws against me.

So the whole place shares the same A/C? You keeping the window open while that's blasting is a huge waste of energy. I don't intend to detract from your other points, but that does seem like a genuine issue to complain about. Have you asked if they could turn the A/C down? Or is there any way to isolate the ventilation?
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