Nice spot in an excellent location right in the heart of Old Zurich. Lots of bars, restaurants, and attractions within just minutes of walking distance. The rooftop is an excellent place for a glass of wine - we even got to see some fireworks, as it was Swiss National Day. The beds are comfy, and the living room is spacious with a good TV. Despite all the bars nearby, it's pretty quiet, we had no issues with our child sleeping.
It is an old building with some quirks, such as the elevator doesn't go to the apartment's floor, so you need to go up or down one flight, and the floors are squeaky. But nothing that's a big deal. Since it's old town there isn't much parking nearby but Nuria hooked me up with an affordable spot that was quick to get to. Highly recommend!