Same here. Lived in both an older 40s and 50s 5 stories building. Small narrow hallways and windows. Build mostly from ridiculous over-sized and thick bricks. But very sturdy. Don't remember hearing neighbors unless they raised an extreme ruckus (usually getting drunk and yelling at each other or kids stumping screaming while playing).

Then lived a newer (built in the early 90s concrete block 9 story building). Much nicer, big windows, larger rooms. Wall not as thick but still very sturdy and don't remember hearing my neighbours same as above. Windows were letting cold air through in the winter and elevator kept breaking often but sound proofing was find and no cracks or structural issues that I remember.