Listening in hotels

I heard from my nephew, about my sister, for Pete's sake. My younger sister, newly divorced, rented a townhouse not far from us. The nephew is a truck driver, the sister was well into her 40's. He was invited to stay on the couch before going back north with his truck. The sister did not have a boyfriend, and nothing crossed the nephew's mind except resting before driving again. He arrived early evening and she let him in, set him up on the couch with blankets and pillow, and headed back to the upstairs bedroom, saying she needs to catch up on sleep. Well, the nephew didn't get any sleep. She already had a casual hook-up in the bedroom. After 5 minutes trying to fall asleep on the couch, the upstairs fucking started. He tried to ignore it but she is very vocal and the sound carried. She only had a mattress on the floor, which I loaned her. (She arrived with nothing. Kicked out for adultery). No bedframe, no squeaks but the grunting and Ahh'ing and his Oohs. and loudish whispers, then bump bumping on the floor kept the nephew awake till he eventually, at some 2 in the morning, banged on the ceiling yelling, 'Fucking shut up, I want some sleep!"
I saw the mattress I had loaned her, sometime later. It had brownish triangular stains in the middle, about where her Ass would be. She can keep the mattress. There were complaints from townhouse neighbors a few times, about the noise.