To be honest, I was little bit scared after seeing mixed reviews here but it turned our pretty good. We went from Nha Trang to Hoi An, bus was there 20-30min earlier but staff informed us about it 30 minutes before it. The staff inside with the driver were really nice, they helped us with our bags and gave us free water and small snack. The cabin was clean with blanket and alright in space even for me (184 cm). Driving was okay without too much honking but dont expect any luxury sleep cause the road is bumpy and there are a lot of turns. There were quick 3-4 toilet stops and bus got in Hoi An around the promised time. I dont know if we got lucky and other people super unlucky or they expect something impossible but i would go again with them. 10/10

We took a day time sleeper bus with HM Happycar from Hoi An to Phong Nha. I received a WhatsApp message from the organizer to ensure we found the bus ok before departing. The bus was extremely clean and in great condition. The little bed capsules were private and lay totally flat, or you could put them into a partially reclined position. I am 5'4" and could lay completely stretched out, my friend is 5'9" and could do the same with flexed feet. There was a USB port, lights and air vents. The driving felt very safe and there were two drivers who traded off which helped us feel safe as well. We stopped 3 times for toilet breaks. After getting dropped off and going about our day, we realized we forgot air buds on the bus. I messaged them via WhatsApp and they responded immediately that they would ask their cleaning staff. They found them and organised a nearby hostel for them to be dropped off at for us to pick up at our convenience. Very impressed overall, would book with them again.