The apartment we stayed was well maintained, very clean and comfortable. Tania runs it very professionally. It's central location with easy access to restaurants and shops. Our kids enjoyed morning walk to the lake and feeding swans. We really enjoyed our time in Zurich.
The only regret was we didn't meet Tania in person. We didn't really need her help once we got our key. But knowing she manages multiple apartments, my advise is best get in touch with her via email earlier if you have special requests.