We spent five days in Vienna in january in the apartment of Alexander & Bettina and was a great experience. The house is cozy, warm, quiet, clean and had everything you could need. Wi-fi connection is excellent. Kitchen and bath super with all the appliance you could desire (also a Nespresso coffee machine).
Location is perfect: near city center and underground station. We are a family with two children of nine and six and they loved to stay at home after a long day out since the flat is quite large and they had a lot of space to play. Alexander & Bettina are so kind, discreet and helpful. We strongly recommend their house.