The appartment by itself was nice and clean. Spacious and modern. Mattress very comfortable. Location 5-10 mins from the center.
But we were cold for 2 first nights. The owner supplied us with not sufficient heating (a small 370W heater for big room) and outside temperature was -1 degrees during the night. He said that it was 8 degrees (maybe the max during day) and that the apartment will be warm enough soon (it wasn't). Next day I insisted on getting another (real) heater and the owner carefully agreed. However this heater made a lot of noise and we couldn't keep it on during the night, so we woke up at 7am because we were very cold.
Then I asked him to him to bring us better blankets because the ones we had were very thin, especially for march weather in Prague (negative temperature in the night). He said we should be fine. At that point I just gave up asking things.
Kitchen was slightly under-equiped (just 2 deep and 2 large plates, no sponge to wash dishes), so at 11pm we couldn't wash the dishes to use them again.
Jakub said that he had some medical problems at the moment we were staying, so we haven't met him in person. Nevertheless, he should have supplied either better heating or better blankets. Spending a night cold in AirBnB is the thing I expected least from this trip.