Our next door neighbour is a sweet lady in her late eighties. She hears everything through our shared wall.
Hand on heart I can say we’re not loud people. I’m not a huge fan of background noise myself therefore rarely have the tv/radio on.
Things she’s complaining about are normal day-to-day, our shower, she hears our pipes, central heating (debatable!), washing machine etc.
I’ve just gone over to hers whilst DH flushed the toilet + ran the shower. Yes, you can hear them if you listen out for them in total silence but it’s minimal, nothing out of the ordinary.
I’ve said to DH about not using our en-suite after 10pm. DH who is usually a people pleaser has zero patience for this and says if he wants a shower at midnight, he should be able to have one.
The same with the washing machine, if there’s a convenient time for her for us to have it on. The problem is that she’s essentially housebound and therefore is always at home. Usually sitting in silence, reading next to our shared wall.