Furnished house or appartment for 3 months

Please, help. I am heading back to Ethiopia for work.
I am going to Addis for a 3 months to work. How much would a decent house(one to three bedrooms, all with bathrooms and toilets, a kitchen, a garage) cost me? And of course, in a very safe and clean area.
I would love also to live in a place not reserved to expatriate only as I noticed some African countries have them.
Could you have any idea about furniture?
Thanks my dear for helping.
P.S. Just in case you are not informed, would you, please pass me PM of some one who is there?
Thanks a lot