By far the nicest hotel in Ethiopia. The Hilton in Addis is pretty good too, but a step down from this place. It is very large, with lush gardens and a nice pool, even a spa. Rooms are nice, not spectacular, but clean. Service is quite formal.
You will pay through the nose for food, which is average.
Very private, very safe (metal detector at front door) - which makes sense, as lots of UN and AU people stay here.
Transport service from the airport is available, though I didn't use it.