The apartment is just beside the main train station. It's really easy to take subway and tram. And it's also near to the old town center. The location is fantastic. All of stuffs in the apartment were very clean and organized. Lenka was very nice. Sent me a useful PDF to explain everything. Included how to take easy transportation, exchange money, and typical food in Prague. Gave us coffee, tea and beer.
Anyway, wonderful apartment and owner!