We had a very nice four day stay at the Grand Chateau. Contrary to some of the aspiring interior decorators on here, I found the room design modern and tasteful, every bit as nice as most of the LV hotels I've stayed in in the past.
Our room was very clean and the king bed was awesome, btw.
We took advantage of all of the facilities at the Marriott and were pleased and surprised to be poolside in LV in January! Great weather. The fitness area was one of the better areas I've seen. The staff was responsive and very friendly.