I was in Lagos for the VS inaugural flight.
On the whole the experience was far better than I was expecting. The Sheraton is not to bad as long as you are not expecting 5 star treatment. The bar and resturants are ok - you may not always get what you order but that's also part of the experience.
Given the VS schedule early morning arrival and departure, crews will not have the time to go walk about but, if you do want to get out the hotel can arrange this, just let them know your destination are time you are due to return - they will provide a driver and vehicle.
Crew transport is by escorted bus to and from the airport/Sheraton and, according to the staff from other airlines I have spoken to they feel quite safe.
I took a day wandering around the airport and had no problems at all, the airport staff are very friendly and helpful.
There is a great deal of work going on to modernise the gate areas and bring them into line with european airports.
On the whole it is not as bad as those who have not visited would have us believe, also the Lagos Airport documentary programme screened on TV presents a somewhat false image, the Airport has changed considerably since the making of the programme.
Cheers
LITOW