Dear Andreas,Yes...exactly right. Bus 12 to Gare du Luxembourg and then change to bus 95 (direction Heiligenborre) getting off at the Vander Elst stop (there is normally a stop indicator in the bus). Mooland is 50 metres walk up the hill from the stop, on the right hand side, second house (no. 5) after the Texaco garage.
An alternative is the airport train to Central Station, then the 71 bus (direction Delta), changing to the 95 (stop on opposite side of the road) at Cimitiere d'Ixelles
Best regards,
Moo