The apartment is very tidy, clean. It looks exactly like the pictures and the beds are comfortable. We stayed there for 3 days (2 adults and 2 children) and the location close to the Naschmarkt is perfect ! It's also only 2 min away from the subway and it very easy to get there from the airport or any train station.
It is easy to feel at home in this flat situated in a nice and typical Viennese building (with an elevator).
I would definitely recommend this flat, direct with the subway or by foot to all the main tourist attractions (Schönbrunn Palais, Secession, Museum Quartier, Opera ...).
Moreover, Nick was really helpfull and communication was easy !