We stayed at the Imperial last summer. It's a place I've known about and wanted to stay for many years. I was a bit disappointed. We had a suite overlooking the Musikverein in the back of the building. I'm with
vuittonsofstyle in thinking it was a little tired. The furniture seemed to have been sat on too many times, and was a bit lumpy and uncomfortable.
The Imperial Torte was delicious. I liked it so much I used Starwood points and brought one home. We enjoyed sitting out front in their little cafe and watching the world go by. And we found the concierge service to be very helpful.
Start at the end of this thread for recent comments:
http://www.flyertalk.com/forum/starw...er-thread.html
They use Bulgari toiletries which I like.