In a word, perfection! I have stayed in many airbnb places all over the world and this is one of my top choices! The flat is absolutely lovely and Christian has put a lot of work into making it comfortable and clean for his guests. The kitchen is fully stocked (I cooked with ease every night) the bathroom is beautiful (amazing rain shower) and the bed is very comfortable! And the TV! It's a true theatrical experience, complete with Netflix and Amazon.
The area is residential and quiet, but just a few minutes walk into downtown and all of the historic sites. The grocery store and several restaurants are just outside the door. Christian was very helpful with transportation directions (subway is just across the street with easy access to/from the airport for only 3.90€) and his communication was always immediate. Christian is definitely a SUPER HOST! When back in Vienna, I will stay here again and again!