I stayed 4 nights with my parents at Stefan's house. It was spacious, clean and convenient. There are trams, buses and underground that take you directly to the train station, the airport, and different parts of the city. Martina greeted us with great energy and hospitality. Even thought she doesn't speak English, she offered the clearest instruction with her translation app. She was also fast in responding to our questions, and was very kind to let us leave our luggages at the appartement for early check-in and late-checkout. We enjoyed our stay and definitely recommend this place.