I had an excellent stay, and will definitely look this place up if I visit Zurich again. A few key points:
1. Tina was an excellent and very friendly host. Could not have asked for anything more
2. The location was great for exploring
3. The apartment was very clean and functional - perfect if you need a home base, but plan to spend most of your time outside/exploring
4. While I did not have any issue with this, it should be noted that the apartment setup is improvised a bit - you get to your bedroom by passing through your dedicated bathroom - the bathroom has one door to enter and another that connects it to your bedroom.