It is in Irchelpark, if you take the tram to Milchbuck and walk into the park, it's on the left (north) side, there is a path that goes past the football and tennis fields (with the fields on the left), before the path goes under a "roof" the climbing wall is on the right. It is not very high though, I've never seen anyone there with a rope..
There is also an excellent bouldering wall at ETH Hönggeberg. From the bus station you walk towards the sport center (heading roughly east), it's close to the sport center entrance, on the other side of the pathway.
I went once to minimum bouldering, it was okay, pretty difficult problems though, it's a sort of a lifestyle-climbers kind of place
. Only options that I know of for rope climbing are Schlieren and Milandia which are very expensive (imho), but big and with plenty of routes of all levels. Pretty crowded in the afternoons though and not inside zone 10, when I go to Schlieren I usually take tram 17 to the end station (inside zone 10) and then it's about 20 minute walk.
So who is hosting the planning / beer meeting?
Off to Zermatt, schönen wochenende.