It's a wonderful apartment, specious, well maintained, good amenities and super good location. We thoroughly enjoyed a week's stay there as our base to explore Prague and surroundings.
Josef is a wonder host who arranged everything in details and provide many useful tips. It has been a great experience communicating with him.
Just a small tip, if you get Uber or Taxi, the car probably cannot really stop just outside the apartment entrance due to traffic regulation, but it can stop just about 20 meters away at the T-junction. So, you could just wait for the car there. BTW, Uber is pretty reliable in Prague.
It has been a great vacation in Prague! :)