I know tipping in Europe is different than in the US as close German friends have explained this to me over the years. They say one should round up. In fact in a cafe recently I saw a German-speaking couple next to me round up to 20 from a bill of 19.60. I probably still give too much.
Anyways I have notice something new (to me) in two cafes in touristy locations in Vienna. In one the waiter, when giving me the bill, said gratuity was not included but it was just FYI. In the second cafe "Gratutity not included" was stamped in very bold type on the bill. Has anyone else noticed this? This is the first year I have experienced this.