Cerin Gul

Training tower for the Keepers of the Dead, the mystics who tend to the lost and ensure their memories and knowledge are passed properly to the The Dreaming and never forgotten - Atlas from The The Glittering Chambers

Probably where "The Keeper" lives, and probably also Qwyn's home, which is concerning to say the least.
Cerin Gul is now confirmed to be the residence of "The Keeper" and is located next to La Marais de Champignons.