The quest got disabled I think because the piano quest is used to get out of
Niff, but you can get in and out using the warp girl. I remember reading a topic where the guy did it
but he got stuck in a place where you couldn't move or do anything and he had to get a GM
to get him out. Also I don't really know about Geffenia but I think there is one way to get there.
Also HOLY that is one ridiculously big quest to get to Geffenia! Too bad this server doesn't have it
it seems like it would be a really fun (maybe annoying) experience. ;D