It looks tidy and judging by the effort he's gone with the photos probably means he/she cares about their cars.
I would definitely take the AA or similar with me, for the sake of £50. Stone chips for me are give away too, if it's peppered with them then my guess would be that it's been driven up the arse of everything.
If you do get it check out the detailing section for some handy tips on those little detailing jobs including taking any swirls out of the paint etc.