I stayed at Barbara's place for 3 months and I can highly recommend the place for anyone looking to stay in Vienna for short or longer stays. The place is in a fairly quite location, yet number of restaurants and shops are nearby. The centre of Vienna is easily accessible via tram.
The apartment itself is cosy, located on the ground floor. It is well equipped for short or long stays. Barbara is great host, very accommodating and quick to respond to messages.