Nico is very friendly and easy-going. The apartment is spectacular with lots of old industrial charm contrasted with modern style.
The location is convenient, but not central. Walking distance to Schönbrunn Palace and less than 10min walk to UBahn station. Tram stops are about 5min walk. There is a grocery store and nice Greek restaurant in the neighborhood.
The apartment is on the third floor (or for Americans the 4th floor), and there is no elevator - just so you know!
I will definitely book again next time I'm in Vienna!