This apartment was great! It was in a fantastic location, easy walking distance to everything, near a huge supermarket, and around the corner from a wonderful restaurant with delicious food and a great river view (Kavarna Slavia - I recommend the slow-roasted pork, the escargot, and the goulash.) It was very clean and spacious, with AC in both bedrooms and in the main room.
Our hosts provided us with plenty of toilet paper, towels, soap, coffee, cleaning supplies, etc., and also provided us with a few candy bars, and even slippers and umbrellas! It was nicely decorated, and had two bedrooms and two bathrooms for a very reasonable rate.
Frederik could not have been nicer. He answered all our emails almost immediately, and was very responsive to any problems. The apartment was very well stocked with cleaning supplies, pots and pans, glasses, plates, etc. They also had brochures and maps of Prague. There is a dishwasher and a washing machine, but no dryer. And be forewarned - it is on the 4th floor, and there is no elevator! (This is equivalent to a 5 story walk-up in the US, with a LOT of steps!)