We enjoyed our stay in Jan's apartment. For four guys who wanted to explore prague and make some party it was the perfect place. For our trip we just needed 4 beds and a warm shower, so everything was fine.
The arrival was uncomplicated. Some days before the trip i contacted Jan to tell him our arrival time at the airport and we agreed that we'll call him when we leave the airport in prague. So there was no problem at all with the check-in.
The apartment is close to the center and central station and also the most other things to see are in walking-distance!