Originally Posted by HereditaryPrincess
The Princely Family still own the palace but I'm not 100% sure if they regularly use it.
The Prince and Princess as well as other family members use the Stadtpalais as their place to stay whenever they visit Vienna.
The Gartenpalais does not have any apartments so nobody can live there.
Both palaces feature parts of the family's fabulous art collection and are very worth visiting. The Stadtpalais is open twice a month, the Gartenpalais once IIRC.