There is a little workaround to reach the Athenaeum. Have a look into your spellborn folder and search for the map folder. Swap the names of the athenaeum map file with one of the other maps. Now you can teleport to this map and instead of the original map you will be teleported to the athenaeum.
The only thing you need to do is to teleport to these coordinates then: X=13286.81, Y=52277.96, Z=-30950.22 (Not sure if these are the right ones)