The flat is amazing, very well decorated and equipped and is really cosy. It has everything you may need.
You can arrive the city center in 10 min taking the tram in front of the flat or just walk for about 20 min. There are also some attractions nearby.
There is also a Supermarket 5min walking away.
The only down point may be the train track that passed direct in the back of the house, but I don't remember to hear any train during the night.
We had a great experience and if we ever return to Prague, we'll definitely stay where again.