My girlfriend and I stayed in the apartment for an extended weekend trip and we had the best time! the apartment itself is stunning and has a great mix of modern, traditional and quirky design.
It has all the facilities you'd need - great sleeping, cooking and shower facilities, coffee machine, tv with channels from multiple countries etc. The place was spotless when we arrived too.
The apartment is no more than a minute's walk from old town square which is great if you want to pop in and out. The place is great if you want to close to have a good night life or explore the cultural aspects of old town.
Finally, there is also a airport transfer facility which is very handy if you're getting a late flight into Prague.
All together, it was a great apartment, great service and great experience in Prague!