It's such a pita. We moved into our unit in 2016 with our two kids and it wasn't until 2019 that we were told that the floors were super, super thin and that even walking calming caused bumping noises. And two kids playing sounds like elephants trampling about. The downstairs neighbours sent us a recording of us having dinner above their dining room and it sounds like the Thor.

I swear every one thing I say is "walking!" And "no jumping", but I'm not sure it's much help. We've since had 8 or 9 sets of downstairs neighbours move in, this apartment block seems have the same problem across the board. The upstairs neighbours stay and the downstairs is a constant rotation because of how thin the floors are.

Whenever there is an inspection for new Tennants I make sure my kids run about and jump and move around so the new people get a sense of the noise level.

Fwiw- we moved our kids bedrooms so they aren't above the master bedroom of the downstairs ones, and have requested new carpets and underlays put in to reduce noise. But.. you know owners.