My family (mon, dad, triplet teenage sons) stayed in the flat for a month while visiting extended family and attending a wedding.
We have nothing but good things to say about our stay. My Czech wife and the boys were on vacation, spending their days going in and out on adventures. The location couldn't be better. Close to metro. Easy access to multiple markets, including a specialized bio (organic) market that made my wife's day. Comfortable walk to the picturesque downtown if metro's not your thing.
The place was clean, tidy, comfortable, bright, and well maintained. Everything worked. The pictures provide an accurate representation of reality. Because our stay was so long, Zuzana also included a mid-stay cleaning and sheet change at no extra charge. Classy touch!
I mostly stayed full time at "home" working remotely, and there is a comfortable common space that served as my office during the day. Wifi was fast enough for lots of video calls, and I never lost internet over the course of the month. Zuzana even provided us with a second key so that my wife and I could be on different schedules.
Other reviewers had mentioned the summer temperature. Prague was crazy hot while we were there (at the height of the 2022 European heat wave) and, indeed, the top floor warms up. But there are three easy-to-open skylights that we would open in the evening and close in the morning to hold in the cool air. With that and the provided fans, we never had a problem. And I was working in the flat every afternoon.
One note not related to the flat ... I recommend downloading mapy.cz. My Czech relatives turned us onto it. I found it far superior to Google maps for getting around.