We just stayed for about 2 days in the apartment and just needed a place to sleep at. Kathi & Peters was perfect for that! You’ll have everything you’ll need.
Also we had to delay the check in time on a very short notice and Peter still managed to let us check in at the time that was good for us. He was very polite and told us a lot about all the places you could go to in Vienna! I would definitely recommend this place.