You can reach it in two steps starting from the main station Z rich. Coming from the track of your arriving train go straightly through the station hall, where you can pass through one of several gates to reach the place in front of the station. This ride again takes only about 10 minutes. The keys are kept and handed out by the institute's secretary. If you find the mailbox stuffed with advertising brochures, try to pull them out.
Garbage is collected in special grey plastic bags with a 'city crest' label on it.
Fortunately as of now there are some bags left. You can wash your clothes in a laundry room in the cellar. The wash plan valid for the whole year can be found next to the laundry door and in the flat. Otherwise other people will claim the key as if it was not wanted by anyone. Alternatively you should be able to get the key also on different days, after talking to the one who is on the schedule.