If someone at Kassel tells you that he wants to meet at the Affenfelsen (ape rock) you should move towards the city quarter Vorderer Westen. The Rudolphsplatz there has been redesigned as an urban living room. People meet outside, sit down in this public area to talk, bring their own drinks and later move on to bars and clubs. And this all with a nice view towards the Herkules monument.
Of course, this provokes conflicts with neighbors as Germans do not meet so often in public spaces as other nationalities. The Rudolphsplatz is also the place where you can find one of the most beloved bars in this quarter: the Chacal. If you want to get a seat inside or in front of the bar, arrive early.