I've done this flight with Yeti Airlines in 2000. We were using the service to get to Lukla to start a trek to Everest basecamp. Basically most of the trekking groups will use Lukla as otherwise you add 5-7 days walking to get to this point. When we did it, Lukla was still a dirt airstrip, but I see it is now tarmac
It's a hairy ride in on the Twin Otter (yes I've seen the YouTube films and it's pretty much like that). The airstrip is on a small shoulder on the mountainside, and the runway is aligned INTO the mountain so you appear to be flying straight at a hillside. There is nowhere to go if things go wrong. If you land short you will crash into the mountainside, and if you overshoot you will crash higher up.....
Whilst we were trekking there was a crash landing at Lukla, the aircraft involved had been pushed off to the side and covered in a tarpaulin, so we went past it on the way out.