Leaving the main entrance, turn right along the post office to the pedestrian bridge leading to Na Malovance bus stop.
Cross the whole pedestrian bridge to the most remote stop (labelled as "Na Malovance bus stop from Hradčanská or Dejvická").
Take bus 108, 174 or 180 to the Kajetánka stop (next stop - approx. 900 m). You get off on the place, where you can see a bus in the picture:
Then go back to the crossing.You stand nearly in front of hall of residence.