Loved everything about it!
Arrived at the W, to be greeted by the awesome decor and upon checking in, we asked where the nearest drugstore was, bc we left our saline solution for our contacts. The gentleman checking us in, opened a drawer behind the desk and proceeded to hand me a great size bottle of Saline Solution. I was so surprised and thrilled! 
The room is gorgeous- perhaps a little dark, because I love light so I notice things like that, but the room was great. 
Anyway, we ate at the restaurant connected to the W- and it was amazing and I am still dreaming about some of the dishes we ate... Our waitress, Emily, who was new, was so sweet and just really tried to make the experience perfect for us. The only thing I can say is that in general, Chicago tap water tastes like pool water- but that's not their fault :)
We had the most amazingly patient and knowledgable concierge, Eden, who helped my husband get on the architectural tour and all sorts of information for his day while I was in a meeting. 
The complimentary coffee was even wonderful!