We stayed at Matthias' place for a few days and it was great! Thanks, Matthias, for opening your home for us, we appreciate it. Everything worked well! The apartment is very comfortable and nicely lokated between Museumsquartier and Naschmarkt, so most of the city center is in walking distance. However, we can also recommend to make use of Vienna's public transport or the almost free bicycle rental system, there are stations near by. Book his apartment and you will have a great stay in Vienna.