My boyfriend and I stayed at Carla & Jana's place for several nights in December/January. The apartment was comfortable, and well-heated (a big plus for the cold months!). It had everything we needed, and Carla and Jana had even kindly left some coffee and drinks in the fridge for us. The reception was very helpful, and the doorman helped us check in and book a taxi back from the airport. It was an easy walk everywhere (about 10-15 minutes to Old Town), and we only ever took a tram once on our way to the apartment the first day from the train station. Carla was very quick to respond to any questions we had.