Mario and Dagmar's place was lovely - it is exactly how it looks in the images, very pretty and cosy :)
It is in a great location as its round the corner from an under ground station which takes you basically anywhere and is also a short walk from the main train station.
Its surrounded by convenient shops - both leisure and groceries and had plenty of local places to eat and drink too. They were very quick to respond to any questions or issues we had which is always reassuring.
Would recommend this place if you're thinking of visiting Vienna!