After careful consideration and re-checking all flight possibilities and combinations we have decided to opt for the VN flights to Da Nang, we appreciate it will be after midnight when we get into Hoi An (the Cathay flight would gain us about 5 hours we would arrive early evening but would meant that we would have to leave our hotel in Beijing in the early hours to get to the airport and check in etc when we can just leave mid morning and not have to rush). Either way we lose the day travelling.

Please would anyone know what the VN lounge is like at Beijing?

Thank you all so very much for all your great advice and help we really appreciate it.