Found and quoted from LLXV:

Q: Will private chambers have access to all furnishings available for the free company house?
A: Yes, they will, so you'll be able to place a vortex couch or other rare furnishings in your private chambers. However, it won't be possible to use garden furnishings. Your private chamber is a room and doesn't have a garden, so naturally you won't be able to use them, but you'll have access to anything that can be used indoors.