Of course. What passed as prison cells in City Hall didn't have quite the protections he had in mind for what he intended. These rooms did, and if it meant an upgrade in the potential comfort of his 'guest' he would simply need to make do with that fact. Her comfort didn't guarantee her complete safety. It only acted as a sort of buffer.

"I shall leave you here," Ansem spoke into the silence, before turning and closing the door behind him as unseen enchantments sealed the room from all darkness. There would be no escape for her that way.