Perfect location: within walking distance to most of the places we wanted to go: Mozart Museum is only 200 meters away, shopping area is nearby, city park is 400-500 meters from the apartment, Musikvereinsplatz is within 1km. And it takes only 2 minutes to U1 which brought us to Alte Donau.
Clean and spacious room, easy check in and check out.
Will definitely come back when we visit Vienna next time!