Just spent 10 days in this apartment in Vienna. Gave the the host and the apartment a 5 star rating for everything. The apartment is fine. Nuki lock system is secure and works exactly as the video shows.
Location is wonderful. Near the subway and trolleys. Lots of restaurants and stores right around the apartment. Five minute walk to the absolute center of the city ... Stephansdom.
Will try to stay here again for my next Vienna trip.