I'd be surprised if this isn't the best hotel in Nairobi. All the business types seem to stay here including Chinese business and government types and what looked and sounded like American business and government/aid workers, not to mention South African business types and tourists from the high-end safari companies.
The hotel is good. Good big rooms with all the facilities, quality bathrooms with lots of toiletries, turn-down service, cable Tv, free in-room wifi - that actually works.
Food wise there are several options including an up market restaurant, a larger more casual all day dining outlet where the Serena signature buffet is available for breakfast, lunch and dinner, plus room service. We ordered cheeseburgers off the menu for an enjoyable late lunch when we arrived hot and dusty direct from safari. At night we had the buffet, and again for breakfast. The food was top quality and very much enjoyed after the night before at Sentrim Amboseli - see my review.
They also have a very well equipped, and well used, gym which I took advantage of followed by a decent massage in the attached spa. The bar, which I didn't use looked fun and lively with football (soccer) on the big screen and lots of people obviously enjoying themselves.
There is also a large lounge reserved for house guests only with international newspapers, waiter service and afternoon tea served each day. This is a very civilised touch and a great place to relax if you don't want to be in your room or the bar.
I liked this hotel. Its more expensive than the others and although it can't match the Sarova Stanley for atmosphere it is a much higher standard and just the place you need after a long safari and a final night in a sub-standard Sentrim. If you have the funds, stay here.