The apartment is clean, spacious and cozy with everything you may possibly need regardless of whether you're staying for only couple of days or couple of weeks/months.
It's located in a few minutes walk to Westbahnhof from where you can (and should) take public transportation that will take you literally anywhere in Vienna in the matter of minutes for the cost that is next to nothing.
Yet, at the same time, the street where the apartment is located is far enough from the main streets and therefore it's very VERY silent throughout the day and night.
Overall, we're extremely satisfied with everything regarding this apartment and will be definitely coming back.