I enjoyed my stay in Nuria's apartment. It is indeed on a best location in old town Zürich and walking distance to all the places I had to visit. The apartment was clean, not huge perhaps, but for me (I was travelling alone) it was just fine. It has a charming atmosphere and very creaky floors. I did not really use the kitchen much, as I was eating out most of the time.
Communication with Nuria, whom I did not meet, was quick, easy and relaxed.