Hi Julien,
There are more then 5 good reason to stay in Congo...........but as you mentioned i will say 5 reasons..........
1. Life is easy
2.Distance between places in the cities are not so far that you cannot reach
3.24 hours Taxi facilities........
4.Affordable accomodations and transportations,communications...............
5.Expats have respect amongst the local.................
Regards,
Anil