My Wife and I had a very positive experience of staying at Hyesook's Flat and I would highly recommend it to anyone making a trip to Zurich.
The Flat itself is excellent. The location is amazing and it has all the amenities you need to enjoy you trip. This includes a spacious living room, a nice balcony with a small table and sitting area, a good sized bathroom and lots of equipment for cooking. This is all coupled with Hyesook's prompt communication and helpful nature, which makes the whole process easy.
We had a great time. I would highly recommend Hyesook's flat to anyone looking to stay in Zurich.