My goal pace was 5 min per km, so I tried to finish the whole run in just under 25 min.
I've chosen my route so that the last km went right through the Schönbrunn Palace Garden and finishes precisely between the palace and the 'Gloriette' on top of the hill, overlooking the city.
Worked out pretty well. But the next time I'm setting such a pace I think I'll train a little to prepare for it. I'll definitely feel that run tomorrow...