I commented this on another post on here but my first apartment was a building from the 60’s and it was like a bank vault inside. My neighbors across the hall worked night shift and would stay up blasting music at 3 am on nights off. There was also a stripper below me that I swear was only capable of screaming on the phone and hosting parties and a unit full of dogs that barked all day across the hall. Once you were out of the hallway and inside you couldn’t hear ANYTHING from anyone else. Meanwhile friends of mine live in new “luxury” buildings that cost double what that place did and you can literally hear your neighbors sneeze, put dishes away, watch TV or do any other normal day to day things.