We had a fantastic stay at Marlies and Dominik's. The flat was beautiful, immaculate and had all facilities we needed. The terrace was lovely and would be great for sitting out in summer (it was still nice in January). The flat is in a great location - quiet but walkable to the city centre (25 minutes) and close to the U-Bahn and tram stops, as well as lots of cafes, bars and restaurants. We didn't get to meet Marlies and Dominik's but Marlies kept in touch and we're available if we needed anything. They also provided lots of tips and recommendations for the area and helpful transport information. We'd definitely stay again next time we're in Vienna!