The MAS CAAD is held at ETH Zürich, on the 'Hönggerberg' campus, which is roughly 5 kilometers north of the main building and the city center. The campus can be reached by the busses 69 and 80 and by bike VBZ > http://www.vbz.ch. A underground parking lot is accessible for students (CHF 200 for 6 months).
It is most times cheaper to stay aroung ETH Hönggerberg campus, but the quality of life is much better the closer to town you are living. Accomodation in the outskirts of Zürich and neighbouring cities is possible but due to long travel distances not really recommended. Accomodation in Zurich costs between 320CHF/month for a room in a shared appartment, up to 1'500CHF ++ for a three-room apartment.