Klaudia's house was a good choice for us. Two adult couples traveling to Vienna with 3 daughters (12, 7 and 3). We fit perfectly on house three rooms. One of the rooms is huge and the other two quite spacious so the experience was quite relaxing. Besides there are two bathrooms, perfect for big groups of people like us. Only small "but" is living room as it is not quite big but having lots of space in rooms is just a detail. In any case, 7 persons could gather around the table to have dinner.
House was really clean, kitchen had everything you may need for a few days. There's a big garden you can use as well. Unfortunately, specially for our children December feels a bit cold for playing outside but such garden must be fantastic for spending some time outdoors during spring and summer, specially if you are traveling with kids.
Location seemed very good to us and quite convenient. Obviously it is not located at the very heart of Vienna but you can reach a subway station walking some 5 minutes. U4 line will take you to Karlsplatz/Opera in a few minutes from there.
And last but not least, a very special mention to Klaudia. She was extremely tender and gentle on our arrival and departure (she even said goodbye to us at 6:30am on our departure!!!). She gave us advice on everything requested and was a welcoming smile to Vienna City.
All in all a wonderful stay at Klaudia's house and definitely a place that we would highly recommend to anyone traveling to Vienna