Jan's apartment is a great investment which I would recommend to anyone planning a long weekend in Prague. The location is just perfect, you can reach anything on foot. We did not use public transport at all! There's a small shop right next to the apartment building where you can do your grocery shopping conveniently. The train station is 5-10 minutes on foot and you can reach the airport from there with bus line AE that departs in every 30 minutes.
The apartment itself is simple, you can expect exactly what the pictures and the description promise. I believe it is a great option for this price especially considering the location. It is also very spacious, we rented it for 3 people, but it can be convenient for 4 easily (two couples or family or friends who don't mind sharing a bed:) ). Despite of the cold weather, Jan made sure the apartment is nice and warm for the time we get there. He is also very welcoming and communication was very smooth with him.
I would absolutely recommend him and his apartment to anyone who is looking for a place to stay for a reasonable price!