A perfect place in a quiet neighborhood. You keep the whole floor to yourself. All the major attractions within 15~20 minutes BY CAR. I think parking fees were quite reasonable(10 euros over 3-5 hours: the Schonbrunn Palace & the Karskirche Church) in Vienna. The only hassle about this place is you need to carry your bag up to the 3rd floor: no elevator.
Thanks again for your quick response & care, Joachim.
Stay happy~!