Germany has several gondola operations today, many are mentioned or profiled here on the blog.
But as far as I can tell, Berlin doesn't have a servizio yet. It's surprising considering the following article:
But lately someone has been rowing Berlin's waters in the Venetian style - Voga Fortuna Berlin.
Here's a recent article in the Berliner Morgenpost about some local enthusiasts:
So far they are rowing for recreation - I can certainly identify with that. Maybe the next boat they get will also take passengers.