I was a bit hesitant booking the sleeper bus because I have heard many horror stories about them, however the ride was very pleasant. We bought the double bed and even though I am 195cm high, the journey was comfortable and I was able to sleep most of the time (although I couldn’t fully stretch my legs. I would need another 20-30cm for that). The bed was wide and the two of us could fit there quite nicely. There were two stops along the way to Sapa (cca every 2 hours) for bathroom and snacks. The bed was clean and the bus driver honked only occasionally. I really recommend this bus. And if you are taller like me, I recommend paying extra for the better bed.