Well, I don't know if the hotel is haunted but I do know that the suite still exists, and still is open for guests too, and that every year at christmas a woman comes into the room. I've heard it is quite expensive to stay there and that only exclusive guests have acces to certain things that deal with the tragic event(Like the Eye-witness account of Fanny Mayer on the event and a dress of Sisi, likely the one she died in), but that others are displayed for Sisi-tourists - as those are called. I've read all this in a book called "In Sisi's traces", whioch travels throughout the world to visit places that once have seen the Empress. I think it is only available in Dutch, perhaps in German, up to this day. It has nice pictures in them, including one of the room she died in.