By air
At the Brussels international airport (Zaventem) take the train to Bruxelles - Nord (first stop after Zaventem, departures every 30 minutes, duration 20 minutes). Then see "By train ". A taxi from Zaventem airport to Louvain-la-Neuve costs around 75 EUR. The trip takes about 30 minutes (take the map, stop at Parking 22).
At the Brussels South international airport (Charleroi) take the bus to Brussels and then take the train.
By train
From Brussels : departures from any of the railway stations in Brussels (Midi, Central, Nord, Schuman or Luxembourg). Take a direct train to Louvain-la-Neuve or take a train in the direction of Namur or Arlon-Luxembourg, stop at Ottignies; and take a train to Louvain-la-Neuve (not "Louvain").
From Namur : take a train in the direction of Bruxelles, stop at Ottignies and take a train to Louvain-la-Neuve.
From the Louvain-la-Neuve railstation, take the steep street to your left (Rue des Wallons) in direction of Place des Wallons, Place des Sciences, and then Croix du Sud (location of ISV main buildings).
By car
From Brussels : take the highway E411 (Bruxelles-Namur-Luxembourg). Leave the highway at exit n° 8 (Louvain-la-Neuve). Take the third exit in the round-about direction "Biéreau". At the second round-about, turning to your right (direction "Biereau, Bruyères" - Boulevard Baudouin 1er) (direction "Biereau, Bruyères" - Boulevard Baudouin 1er).
On Boulevard Baudouin 1er, after about 200 meters, take the first turning to your right (Avenue G. Lemaître) and then the first turning to your left (Avenue Théodore Schwann). Head for Parking n° 11, 12 or 22.
From Namur : take the highway E411 (Namur-Bruxelles). Leave the highway at exit n° 9 (Corroy-le-Grand, Louvain-la-neuve). Turn to your left and take to your right at the round-about (direction "Wavre"). Pass one round-about. At the next round-about take the third exit (direction "Biereau, Bruyères" - Boulevard Baudouin 1er).
On Boulevard Baudouin 1er, take the first turning to your right (Avenue G. Lemaître) and then the first turning to your left (Avenue Théodore Schwann). Head for Parking n° 11, 12 and 22.