We stayed at Sentrim 680 Hotel Nairobi Kenya for one night. It is located in the centre of Nairobi, which is good if you have some business around, so you don't have to take a taxi all the time.
We walked to a nearby travel-agency and to Java Coffee bar, no problem. We felt quite safe walking around during the day.
Would not do it in the night though. Can really recommend Java, in my opinion they have the best coffee in Kenya!
The room was small and outdated, but clean, and ok for a night. The breakfast was not so good, but with a nice view of the street outside from the restaurant. Don't buy breakfast if it is not included.