Hello! I do not have any first-hand information, but since no one else has tried to answer I will give it a try.
Brazzaville and Pointe-Noire both rank very low in one quality of living survey (the green table). Worse than Kinshasa, which I thought was too dangerous to visit!
finfacts.ie/irishfinancenews/article_1016548.shtml
Here is some more information:
lonelyplanet.com/congo
According to that site, the cost of visiting as a tourist is US$30 to US$60 a day (INR 1,336 - 2,673). It does not have an estimate for living there.
A currency converter:
oanda.com/currency/converter/