Khashayar was very helpful with getting us a last minute reservation and even upgraded us to a bigger apartment, helped us with our parking when we just got in. The apartment in itself was very comfortable and had the amenities you'd want. (Please note it isn't the same apartment as in the listing)
From a location standpoint, it was 3 blocks from Karlsplatz and a 10 minute walk to the Opera. The neighborhood is okay. Its safe but not very lively (if that's what your preference is).all in all, good value for money.