Spacey, Beautiful and extremely well-located apartment in a grandiose environment which we all enjoyed and highly recommend. Right in front of the Karlsplatz U-bahn which is very practical and at a walking distance from the Naschmarkt which is amazing. A great location to enjoy Vienna from!!
(P.S. small detail: check-in very rigid as you need to know the EXACT time of your arrival in advance which you will be repeatedly asked for in order to set up a rendez-vous)