Ondrej always answered very quickly and even when our flight to Prague was delayed (at 6 am in the morning) he informed the taxi driver immediately. The apartment is clean and modern, the only thing which is missing is a cupboard. But when you only stay a few days and do kind of a weekend-trip it's really okay to do not have one.
The guys from Ahoj Hostel were also very friendly and we could always ask them for help and leave our luggage in their luggage room.
I will definitely visit Prague again and would book the apartment a second time!