Rental and Cost of Living in Addis

Hello Dear Expats,

I'm getting ready to move to Addis for a 3 months internship. It is an unpaid internship therefore I will very much appreciate any advice not to be too much in debt.
I'm 26 and single and would like a furnished studio flat or 1 bedroom apartment/house not too far from the office which is located Menelik II Ave. (UN). I don't mind taking public transportation to the office. Below are my questions

1- Housing
  1.a How can I find a place to live? The internship starts sep 1st, i'm planning on arriving couple days before and stay at a hotel and do some viewings... also any advice on where to for those couple days? Also please give me couple areas to look into... all I know now is Bole
  1.b How much would a "furnished" studio or a 1 bed room apartment/house cost per month? I don't care about the size. All I care about is the cleanliness and the location, oh and the flat should be furnished (refrigerator, bed table etc..)
2- Cost of living- How much should I budget for cost of living. I like cooking and go out sometimes...
3- Any additional advice or tips will be appreciated.

Thanks in advance.