“Loved our stay at this apartment!” We spent several weeks here during the off-season. It was by far one of the better places we've stayed during our frequent travels to Croatia, and we will certainly return. Pros: very quiet building, amazing views of Zagreb from the balcony, clean and well kept, nicely decorated, comfortable bedding, modern kitchen (with a good stocking of essentials). It is a quick walk to the tram into the main sites. There is also a market just near the apartment.
Big plus: washing machine in the apartment. This is not always the case in Croatia.
The owner, Davor, was also very kind to us and helpful in his tips about the city.
I think tourists often use Zagreb as a transit point, but would encourage visitors to stay more than a day or two. The city holds nearly a quarter of the Croatian population and has great character. We loved it and plan to return.