I was in Zurich on business and stayed 2 nights with Anja (& Aphra).
The flat is pretty central, I walked from the main railway station in about 10-15 mins and close to trams (<5mins) to get you right into the centre (Paradaplatz) in 10 mins.
The flat was very clean and tidy. The room was a good size, comfortable bed, wifi. Basically everything I needed.
Anja was a very helpful, interesting host (probably speaks better English than I do!). Aphra is delightful. Such a calm gentle dog.