A gorgeous Victorian house that no realtor can remember to sell. It has a garden filled with thorns and is covered in an everlasting frost.
At the center of the yard, there used to be a hawthorn bush which was often but not always the scene of every Test when the Winter Girl-to-be would lift the Winter Staff that was implanted in the middle of the shrub.
Due to Beira's past abuse, after she became the Winter Queen, Donia tends to avoid the house but since it is a metaphor for Winter's palace and also where all the Winter fey take root, she has made it a headquarters for the Winter Court to deal with official matters. Other than that, Donia spends most of her time at her cottage.