A strata manager recently said to me that a wooden floor is just always going to be noisy, no matter what. Carpet, insulation, rugs… whatever, there is always going to be extra noise transmitted. Be it actual hoofs-on-floor or the extra echo effect produced by wooden floors. All you need is one, even slightly inconsiderate member of one household with a wooden floor, and everyone else’s life can be hell. Sad but true in my experience.
I know an architect who put a one foot layer of sand between a two level 50s apartment block of 4 Two up, two down) in Rose Bay; it hardly helped at all.
Also, don’t let anybody tell you it’s only the people underneath that it will effect. We hear the wooden floor two levels below us.