Lusaka, I need advice please !

Hello !

My name is Arnaud, I have 24 from France and I have the possibility to come to work at Lusaka for a 2 year's contract.

I am currently reading many articles about Zambie but I would like to know the opinion of the people who experience the life at Lusaka.

Here are my questions:

How is the average security of Lusaka ?
Is it recommended to drink only water from water bottle ?
How is Internet connection facility ?
Is there many mosquitos ?
Also, do you know many expatriates of my ages (or around) living at Lusaka ?

As you can read, I have many questions and i am looking forward reading your answer !

Merci à vous,

Arnaud