Now I'm even more sorry that we didn't get to talk longer during HiveBeeCon. I lived in Tarnow for a few years and could recommend many places in the town. But one of the more interesting ones you found on your own. BTW, the world is too small. Cafe Tram is run by a friend of mine (and his brother who was there during your visit). He is a well-known DJ in Tarnow. In 2009 we even recorded an album combining folk and rap. And my wife, @foggymeadow, did the illustrations that are on the windows.
How long will you be in Riga and from when?