I am just coming back from 5 days trekking Mt. Kenya. It is very confusing to choose a good trekking/ safari company in Nairobi. I want to recommend Mountsafaris adventure www.mountsafaris.com
as a fabulous company to go with. The guides and porters were very knowledgeable and professional and managed to get everybody of the 29 member group I went with (mostly people from the British army on an adventure training trip)
to the top of Mt Kenya. The food was great, the atmosphere cheerful and friendly, and everybody was always supported by the team of guides, cooks and porters, both with offers of help,carrying backpacks, or just a smile at the right moment. We managed to get up to the 16355ft. viewpoint at pt. Lenana at exactly dawn and experienced a fantastic sun rise over the stunning mountains.
These guys are reliable, professional and deserve being praised in your forum!
Micheal