Ha, I was in charge of data quality for Google Maps going on 15 years ago. Addresses were hard then, and I'm sure they're hard now. Alas, Google didn't want to invest in keeping this data high quality — a fact to which I actually owe my first promotion at the company (since taking over Maps data quality was a job that nobody else particularly wanted — nor did they want to move to Seattle, where Google wanted the team — but it still gave a lot of room for impact).

Sometimes I dream of going back, but the culture has changed too much (and not for the better, I hear).