Ferdinand communication was excellent; with a visitors guide sent upon booking. The apartment is beautiful. The best Airbnb we have stayed at. It is very well equipped; everything you would expect....and more! It is very modern; with some antique "twists". It's in a brilliant location just off Viennas Main Street with bars, supermarkets, cafes and restaurants nearby. Only a 15 minute walk to the "innere stadt", 15 minutes to the famous Nachtsmarkt, 15 minutes in another direction to the main station*, Belvedere Palace also very nearby.
*** Shops do not open in Vienna on Sundays [or on Public holidays] (except cafes, restaurants and souvenir shops). We arrived on a Sunday to discover this but found out that one of the five supermarkets which open on a Sunday was at the main train station nearby so we were able to buy a good selection of provisions!