HOW DO I GO TO THE THIRD FLOOR?
There's a shouty neighbor blocking your access.
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Pay attention to what he says.
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It seems he's cooking something and is missing a basic ingredient. The second most important ingredient to be precise.
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If only there was a way to know what he's missing without talking to him.
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Have you been to the maintenance room?
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You'll find the recipe he's using under the dust pan (he borrowed it from the maintenance supervisor).
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Have a look at the ingredients. Hopefully the one he's missing is one you can easily find.
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Look at the discarded gifts outside apartment 2C.
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Go up to the third floor (you should have an opportunity now) and leave the wine bottle on his doormat. That should keep him busy and happy (and out of your way).