Hi Molly,
I think the best way is to have a shared house with other experts and we have many here in Kigali if you will be based in Kigali. You can also have you own apartment if you don't mind about rent prices. Here is a yahoo group where you will find more announcements especially for people looking for housemates, leaving experts who are selling their stuffs, etc. groups.yahoo.com/group/kigalilife/messages‎. Join the group and start interacting with people. I would suggest that you create a yahoo email for this purpose. Like everywhere on internet, you may meet scams, never send money, don't pay for something you don't see! If you need more information, do not hesitate to contact me, I will help! Welcome again in Rwanda!