Jenja and Björn's apartment is in a central location in Zurich, about 15 minutes walk from the train station or about 10 by tram. Buses and trams are all available very close by, and there are plenty of food options around.
For whatever reason we were in a room other than what was listed, which was a good size, however the mattress was on the floor rather than a bed frame, and there was a significant amount of hair through the sheets and on the floor of the bedroom and bathroom. This put us off somewhat. Assuming it was a bit cleaner and a proper bed was in place, I wouldn't mind staying again.