I feel your concern, not about stranger danger, but my husband is a very heavy sleeper.
We stayed in a hostel in the Alps a few weeks ago and the toilet was opposite our family room.
DS 7 insisted on sleeping in the upper bunk. I was woken by a bump at 2am, DS had fallen off the ladder getting up half asleep. Helped him to the toilet and the door closed and locked behind us.
DS slept through all of this and us banging the door. 
Then I put DS in the lower bunk once DH eventually got up. In the early hours he got up to go again I was aware of him getting up, but this time he left the door wide open and as it dark I didn't realise (they had those timer lights) I only found out as I woke at 6am with my butt hanging out of the duvet, to find a family peeking in the room. My bloody iPad, car keys, wallet etc all on the desk!
For comfort in the tent, take an old washing up bowl or camping toilet and a special torch for DS. Then if he wakes in the night, he can just have a wee in his pod, or just outside. I also make sure if I zip him up that the zip is within his easy reach, or there is some wriggle room for him to get out.
I wouldn't wish my DH on a shared dorm of anyone, his snoring would drive them crazy.
DS stayed in a kids only hostel for camp, and woke needing the toilet, which he found locked!! Poor thing had to wee in the wastepaper bin. Older kids were ribbing him, I was bloody furious.
If it makes you feel more comfortable, tell him to book double rooms only.