Agreed. I always request that I'm either allocated or reserved a bottom bunk as I have a disability and find it difficult to climb a ladder. I have done a couple of stays on top bunks when this hasn't been possible or has been ignored and it's definitely not as fun!
I had two hostel visits last week. On Thursday I stayed at YHA St. Pancras, the room was very hot which meant everyone in boxers. In the morning I was wanking whilst a cute Spanish guy went for a shower and actually got caught unaware for once when he came back out! Turns out he couldn't work the shower, he was totally not phased by the fact I was wanking and asked me to work the shower for him. I find European guys are almost always totally fine with hostel wanking!
The next night I stayed at YHA Cambridge in a very small dorm with two bunks arranged in an L shape, meaning I had a clear view of the guy in the next bunk, a handsome athletic older guy. Nothing happened but he had very nice big feet which were right in front of me and slept in his boxers with a nice bulge. He was unfortunately gone by the time I started my wank in the morning, so it was just me and a guy in the bed above him who came in drunk in the early hours and fell asleep with his clothes and shoes still on.