The Stanley offers a convenient and safe place to stay while in Nairobi. The hotel is decorated in an early 20th century style - elegant, lots of dark stained wood, with a colonial feel. This facility includes a large area for breakfast, a separate restaurants, bar, swimming pool, and health club. The rooms vary in size, but most are comfortable and spacious; the bathrooms are large with the usual features.
The breakfast buffet is excellent, with a wide variety of foods available, from a traditional European "continental" style to a range of hot items and eggs cooked to order. Western travelers will see some things that you don't recognize (especially among the vegetables), so you will have a chance to try something new. The restaurants and bar are also nice places to eat or visit. The health club is well maintained and has a wide selection of equipment.
Security is good, with screening for all guests entering the lobby. Security guards in the stairways prevent problems at night. They are always friendly. Strike up a conversation and learn some Swahili!.
However, be prepared for the realities of visiting a third world country. Of course, don't drink the water. Bottled water is always available from the hotel, and local stores are a short walk, where you can buy additional food and water. The internet connection is not always reliable, and sometimes the electricity goes out. The hotel does a good job of trying to shield the guests from these issues, but there is only so much that they can do. Please be patient with them; it is rarely their fault.