For travellers requiring a relatively inexpensive hotel in Addis, the Mimosa is adequate. The staff are helpful and the suite was clean and comfortable. However, the chorus of barking dogs through the night made our sleep problematic. The staff were very willing to change us to the back of the building where the dogs were marginally less bothersome.
The hotel is located in a laneway between two streets, one of which is a red light district. It is not within walking distance of the city centre of other areas of interest. Taxis are cheap but I would advise asking reception to call a taxi and prearrange a fare. One the second evening we went to the Serenade restaurant for dinner and although the receptionist arranged for a taxi to collect us afterwards, there was still strong haggling over the fare. By the way, the Serenade, although relatively expensive, served excellent food. It is located up a very dark alley way and our driver had great trouble finding it. Reference is made to it on page 101 in the 2009 edition of the Lonely Planet.
We are in our mid sixties and I will have to indicate that I would not recommend this hotel unless sleeping with hounds in not an issue. We booked a suite (not much more expensive that the rooms) which was large but I didn't see inside the rooms.