we had nice time staying at Harald's space. Apartment is spacious and dog friendly, perfect for family or group of friends trip. Location is perfect for exploring Schonbrun castle and zoo, and well conected with a city center by metro. Very close to apartment (100 m) there is a big and fenced dog park where you can freely walk with your fur friend without leash and muzzle. I strongly recommend Harald's place to stay in Vienna :)