Bus left at 18:00 from Vientiane Southern Bus Station. As usual in Laos, it travelled quite slowly due to the numerous potholes and washouts in the road. The Bus made it into Nam Phao/Cau Treo Border post at 02:30, whereupon the driver, lined up in the growing queue of busses and turned off the engine (and therefore the AirCon). I was only just getting used to the various tonal snores of the various people when I dropped off myself. The bus driver and his offsider were helpful, though they didn't speak any English, giving me the nod when to get off the bus and where they would pick me up from. Get off at the Lao side, get stamped, walk about 1km to the Vietnam side, get your passport stamped, hopefully you have an e-visa and meet the bus. You have to then take your luggage off the bus and send it through the luggage scanner, collect it and wait while the border guards give the bus the once over. After they have, put your luggage back on and hi-ho away we go to Hanoi Nuoc Ngam Station. Bus was comfortable,in that I fell asleep a number of times. The AirCon is Arctic. They do give you a pillow and blanket, which is helpful, but wear thick socks and rug up. You HAVE to remove your shoes to get on the bus. They lay a strip of mattress on the aisle, so passengers can really stretch out and when you get off the bus, especially to the toilets, the ground is just plain filthy and you don't want to bring that back. They do provide you with slippers for when you get off the bus. However, either bring your own or buy some at Vientiane Southern Bus Station, which is what I did. All in all a good experience, The driver was exceptional as a driver, managing to avoid most of the potholes and just keeping the bus journey really smooth. Caught the Wednesday bus (with no on-board toilet or WiFi), rest stops about every 2 hours. Got into Hanoi Nuoc Ngam Station at 18:00.