We (two adults and two teenagers) stayed for five nights in the apartment and we loved it. It is very central with a lot of restaurants, fastfood, a supermarket etc. in the area and we managed to go everywhere without using public transport. The apartment has everything you need.
Umur is helpful and responds to messages very quickly. We arrived by car and Umur helped us finding a parking garage nearby (finding public parking space in central Prague is almost impossible, by the way). There are several tramlines in the street below - it's not noisy, but you can hear them.
Prague is a fantastic city and should we ever return, we would choose Umur's apartment again.