Pool was an important part of my life in Brooklyn. I played on a team for the NAPL, I competed in the Stickman 8-ball Challenge, and I played for fun all around NYC every night. New York has a highly developed pool scene: It's easy to find Pros like Tony Robles hanging out at Amsterdam, or league players smacking them around on bar boxes city-wide. Even the pedestrian players are pretty good - but most importantly they are there. If you go some place to play pool, expect to wait for the table and play competitively.
The first thing you need to know about pool in Europe is the rules are quite different. Any foul - including a table scratch or a pocket scratch - means your opponent gets two shots. It's pretty interesting, and I'm excited to play this way, but everybody seems to have a different take on how to apply these rules, though. When I find out more, I'll update.
Another important thing to know is Germans like to gamble, but they don't like to gamble for a lot of money. This is a welcome change from the states, where nobody wants to gamble with you unless they are much better than you, and everybody who is much better than you wants to gamble for a LOT of money. Gambling here is a cultural norm I think - there are video casinos throughout Stuttgart. They are never crowded, but always populated.