Rented six apartments in the US. Only once had a noise problem, solved by an email to the leasing office. Though admittedly they were all in the "nice" neighborhoods.
If the percentage of noisy apartments were 90%, the probability of me randomly landing in 6 quiet apartments out of 6 would be 0.1^6, or one in a million. If the percentage of noisy apartments was 10%, that probability would be 0.9^6 = 0.53. So, given my experience, the latter case is 0.53 / 0.000001 = 530,000 times more probable.