The "Tauschring" idea seems to be catching on in Switzerland, too. The idea is to bring people together so that they can swap services. One person bakes a cake, another helps with the tax filing, someone paints a room or takes photos. I have never been, but I can imagine that this could also be a place to exchange English conversation for German conversation, etc.
In Zurich, one address is Treffpunkt Solino, Schanzengraben 15. More info at
www.solino.ch/tauschtreff. They are having an opening party on May 10, from 4 p.m. to 8 p.m.
There are also Tauschtreffs in Hottingen and Wipkingen and other Swiss towns, too, just google "Tauschtreff" or "tauschen" and the place.
Idgie