Katja's place is perfect for a short or long stay. It has everything you would need and is really cozy. You can even enjoy your coffee on the terrace. The metro station is near by, just a couple of minutes of walking, so you can go anywhere in the city. Katja is a lovely person, she is eager to help you with anything. I had to shorten my stay because of a technical issue at work (with which she tried to help me), but I would stay again at Katja's place next time in Wien.