It is a really nice apartment, everything new and clean. Just a couple of things to consider, the apartment is managed by a company so there are not really flexible with the check-in hour (30 euros fee to enter before 2pm) and as Andreas mentioned in the publication, they charge 250 euros as a security fee that will be refunded 1-3 days after you leave the apartment.
The person who was asigned to manage our apartment couldn't answer a couple of questions when we needed but it might be related to the same factor mentioned above.
The apartments in the building are not all from the agency but anyway there was a student apartment over this Airbnb and on Saturday night from midnight until around 3 o clock in the morning there was a party with really loud music. We had to go upstairs and talked to them.
More than that, it was a really nice apartment, everything new and clean. The location is also nice, there are a couple of supermarkets next to it and possibilities to use public transport nearby (U4 Pilgrammgasse, bus station 59 A leads directly to Naschmarkt,....)