Our first condo was a first-floor unit. There was a requirement that the upstairs condos have cork in the floor so there was no noise that intruded into the first floor. Our realtor, who sold us the condo, never told us the condo above us didn't have this. And she lived in the complex.
We could hear when the guy above us had women over during the night because we could hear the high heels clicking on the floor. We could also here him pee at various times. We had Saltillo tile in our condo, which made the sounds even worse.
One day, I went upstairs and asked him, "Do you know we can hear you pee at night?" He was completely shocked by this. I knew it wasn't his fault, but we were at our wit's end.
We eventually sold the condo and were glad to get out.