We stayed at the Optimum Cozy apartment during December and we are going to be there again throughout January. We recently started our new jobs in Zurich and rented the apartment to have some time looking for a new flat. Luca was very friendly and supported us the whole time in everything we asked for...also in getting our official swiss documents. We felt very welcomed and enjoyed our stay. The view from the apartment over Zurich is amazing.
One point which should be mentioned is that if you are not very well by foot than a car is recommended since the street to the apartment is very steep and the last bus goes shortly after 7 p.m.