We enjoyed our stay in Vienna. Johannes´s apartment was great for 4 people (2 couples).
It corresponds exactly to the announce. The kitchen/living area was actually bigger than it seemed in the pictures. All the furniture, the appliances and the dishes were brand new. The apartment was clean; we had clean sheets and towels. The beds from both of the bedrooms were very comfortable. There were even candies on each of the pillows which made us feel very welcomed.
The location is close to the Schönbrunn Palace (10 maximum 15 minutes of walking). There are 2 metro stations in the area which gives you easy access to the city center.
If you travel with a car and you want to leave it in a parking place during your stay in Vienna, I recommend the Park and Ride Ottakring. It costs 3,4 euro per day. You can leave it there and then take the U3 metro from Kendlerstrasse to Westbahnhof which is 10 minutes from the apartment.
We haven´t met Johannes but we had a great communication before and during our stay. He responded immediately to all of our questions.
I definitely recommend his place.