a buddy of mine is renting a small house in a secure compound a 1-2 hour drive from airport, and the price is about $16,000 a month. He had to pay 18 months, the entire term of lease, in cash up front... of course it is a corporate (not oil) expense account...
late 1990s thru early 2000s, Luanda was one of my favorite spots in Africa, but it was no where near as chaotic then...