We really enjoyed our stay at Alex and Kate's place. The location is amazing and was (for us) within walking distance of everything we wanted to see. (With that said, we like to walk a lot!) The unit was very clean with a nice shower (albeit small) and Alex and Kate are quite responsive to messages. They offered us an airport transfer for 22e upon arrival and that worked out well because the driver stopped at their office to pick up the key and let us into the flat. If you don't accept their transfer, you will be making a stop that is not within walking distance of the flat. Overall it was a very pleasant stay and I would recommend. Prague is amazingly beautiful with incredible architecture. And you can't walk 50 feet anywhere in the City without stumbling across a quaint cafe or pub to have a delicious bite or tasty, inexpensive beer located in a 400-year old building.
Now, for the downside. We were there toward the end of summer and since there is no AC, the apartment was very warm. Only one bedroom has windows. When they are open, cool night air does flow in. But, the window opens to a noisy courtyard, which among other things, houses a daycare that opens at 6AM. Also, the church bell chimes every hour so it's difficult to get a good night's sleep with the windows open. The other room is much quieter, but since there are no windows, it's very warm with no air flow. And the blanket provided is heavy. I requested a room fan several times to which they initially agreed. But I stopped asking after my third request was politely ignored. If you plan to stay, do it when the daytime temperatures are not in the 80's.