This was a fabulous location for our trip to Vienna. Directly off the main tourist area and a block from all public transport including the river (for boat tours). The apartment was large and well maintained. Air conditioning (3 mini splits) worked great for the very hot week while we were there. Bathrooms were well stocked and had great water pressure. Kitchen was modern, but missing many smaller items needed for cooking and does not have a real coffee maker (nexpresso). Plenty of space for four of us. The beds were comfortable, but the sitting room seating is as pictured - straight backed dining chairs suitable for the table or a deep couch that isn't comfortable and not large enough for four people. As mentioned in other reviews, the tv's are plentiful but worthless, as they do not have a wired network connection and the smart tv in the sitting room would not connect to the Wifi. The apartment is quiet despite being so close to the main drag. Noise was only an issue on weekend nights from late partiers wandering through the street. A downside is that there is no provision to drop luggage early at the apartment, and Griechen could not direct us to any other options. (Hint, one options is the Vienna Mitte train station has economical lockers - 15 min walk. A second is a Luggage Hero location one street over from the apartment on Schwedenplatz - not sure on price.)
Overall it was a great choice to do tourist activities in Vienna.