I stayed in Martin's appartment with a friend for 5 days during my short holiday in Vienna. The flat is conviently situated near Rathaus and there are bus stops almost outside the building if you don't want to walk. There is also a U-bahn station at 10 minutes' walk, which can take you anywhere in the city. The appartment was clean, warm and really private, as there is no flat next to it. The neighbourhood is quiet. Martin was helpful answering all my questions, so we didn't have any problems. I recommend it to anyone.