I certainly wish Irene or her Mom had let us know that the guests below , them who had a child. were being loud and I certainly would have asked them to please address it. We live here too and did not find them to be loud but our apartment is situated differently from the rental units.
We do have guests with kids sometimes and the people below them were very nice and would have been happy to do something about their child IF they were asked.
Irene forgot to mention that they -she and her Mom- flooded the apartment with the same guests in them by letting the sink over flow . The guests with the child cleaned it up and did not bother Irene with it. Nor did I , other than to ask what happened.
I would like to know if ONE Brooklyn Brownstones exists with an elevator . There really is no such thing that I know of as a New Yorker of 33 years!
We put new carpets in the apartment and we have stayed up there many times with our child and none of us have ever gotten a splinter.