Hey,
I stayed at Fairmont Mt Kenya in November 2017, it's a nice location - but if your primary reason for visiting is Safari, go to the Masai Mara. I did both on the trip but stayed at Ashnil Mara Camp, over the fairmont property.
Food at Mt Kenya was great, staff were fantastic. Was quite chilly after 6pm but the rooms had a fire which was lit at turndown service.