Hi Gajendra,
My name is Raymond my friends calls me Ray. I'm from the US now I'm trying to find work in the Congo. If I was in ur positions, I would've jump up and down for his. Lubumbashi is a great city and its no way near any area where Ebola was detected. The Ebola situation in the Congo is well controlled and the country has good experience with it.
So to make it short I'll say your contract is not the best but it's ok and you should go for it.
Regards,
Ray