The flat in itself is great. It has many windows, so is bright. It is also very quiet. I enjoyed the big TV as well as the spacious kitchen and balconies. Overall, I had a great time there.
In terms of location -- while it would be hard to walk to the city -- it is not far by tram. In particular, there's a direct line to the main train station and another to Paradeplatz.
The main drawback is the quality of the internet connection. In itself, it is fast enough, but I think the router cannot really handle streaming very well. As a result, it reboots very often and one has to enter a pin manually every time.