Just got back from Venice, so am asking advice a bit late.... Usually, I just look at the check in Europe to see if I need to really tip. There will either be a service charge added on, or a note saying that service is not included. This time, I was in many restaurants that gave bills that showed no clue if service was included. I assumed that this meant it was not, and so tipped 10-15% - but the look on the waiters' faces made it clear that we had overtipped. Any advice?