Theres a few 'Carling' academy's around london. It could be either, brixton and islington academys' are both in London, and both owned/sponsored by carling. So make sure you know which one it is.
Brixton is a bit of a dodgy area, but its only a short walk from the station to the academy, and the road wil be full of people attending the gig, so you shouldnt get any hassle at that time. Wouldnt reccomend hanging around there unnecessarily though.