You can find a 3D map of the campus and its surrounding area here. In this map you can find the buildings K and Ke indicated by the letter K, the location at Pleinlaan 9 has been indicated by the number 9.

Buildings K and Ke are closest to the entrances are 6 or 8 on the Triomflaan, while Pleinlaan 9 is between exits 12 and 13 across the Pleinlaan.