When communicating with neighbors, the main thing is to be polite and avoid negativity. Sometimes the neighbors cannot be found at home. In this case, you can write an ad for them and hang them on the stairwell.
Neighbor message example:
Dear neighbors from apartment X!
You’ve pierced your ceiling (and our floor) through and through. We have a huge bump crawled out under the linoleum.
Please visit us so we can resolve this issue.
Neighbors from apartment X (X floor).
It is advisable to attach some funny picture to the ad, for example, Carlson.
So you can set up communication in a positive way and avoid unnecessary conflicts and hassle.