Lisa's mother looked after us and made us very welcome. She gave us plums from the garden which tasted delicious. The apartment was great for us...less than half an hour's drive from Vienna. A lovely quiet residential neighbourhood. The flat was bright and spacious. It had its own entrance by the main front door. There was adequate street parking not far from the house.
There is so much to see in Vienna we didn't have anything like enough time...only one day. We'll have to go again.
We used a Park and Ride car park, (which was very reasonably priced compared to all other carparks) and borrowed Citybikes. These were brilliant. They are practically free if you follow the rules. Just register with the system before you go on holiday, which only costs a euro, and make sure they click properly when you return them.