Alexandra and her mom are amazing hosts! They thought of many details, especially relevant to our young son. They made sure the space was equipped with everything we needed, had extra items like toothbrushes and lotion in case we forgot anything, and provided nice touches like wine. Alexandra's mom also provided a great overview of the city and was warm and welcoming.
This is the best place I have stayed at travelling with my 20 month old son. They not only had a crib, but many toys suitable for his age. I also saw things that would be suitable for older children as well.
In addition, the location is excellent! It is walking distance to everything in old town, literally across the street from the airport bus, and a short walk from the underground (which is on the same lines you would take for the train station, Schonbrunn Palace, Prater, etc.)
I highly recommend this Airbnb.