The apartment is very close to city center. It is good value for money and I recommend it. Alex was ok, although a little stiffed at the beginning. She arranged us the transfer to and from the airport. Easy communication with her during our stay, excepting last day when she didn't return our call, since it was on a Sunday afternoon.
Although it is situated in a Red district area, we did not have any issues regarding this.
If you visit Prague, you should choose this apartment.