Amazing!!
Best hotel in Chicago!! I've stayed in many modern hotels before, all luxury, but I can't help but love the Palmer House the most. The Hilton Chicago is great as well but so far removed from Everything else. Honestly my best memory from this trip is getting back from a long day of walking and sitting in the lobby with a box of Frango bought from Marshall Fields with my family. With the calming Christmas music and amazing ceiling it makes the perfect atmosphere. 
They don't make hotels like this anymore. I tried exploring the whole thing but its just to huge! There are hallways and ballrooms, spiral staircases and old creepy ones. One time I entered a stairway that was absolutely terrifying but exciting at the same time, and when reaching the top I came out on the balcony overlooking the grand ballroom. The staff is great and gave us no attitude for searching the place from head to toe. There were others looking around its many ballrooms as well and is an Amazing building with so much history. 
The rooms were very nice but obviously old. I didn't mind at all but I will warn you. The pool was old as well and not as good as some of the others I've seen in Chicago ie Marriott residence inn where the pools on the roof and has panoramic views of he city lights at night with glass windows all around you and you can go on the corner and it feels like your standing on the edge of a building. The palmer house pool has a glass roof and is in a courtyard. It does have a hot tub too which is nice. I honestly can say that whenever I go to Chicago and stay somewhere else It will not be the same.
Wish I was there right now. Stay at the Palmer house and you won't regret it.