I enjoyed staying in Zürich at Peter and Engin's place. It was affordable and in a great location near the university and with easy access to public transport (Toblerplatz tram stop) and stores (several groceries stores, bakery, pharmacy, etc. all less than a block away). The shared kitchen was a bit spartan but it got the job done with the burners and microwave. The shared bathrooms were generally very clean. The room was great and had plenty of space for one (or even two) people.