When we last went two years ago, they didn't have any bed guards. We forgot to put one in and asked at reception, to be told that they didn't provide them!
He is quite long. About 93cms I think. We can always put a chair beside or bedside table maybe.. It'll be fine I'm sure. He just started to launch himself out cot so was safer to put him in bed. No way he'd sleep in travel cot now though..
Ds has not long since had his bed guard off and he was fine in the bottom bunk and he's 102cm (ish) and a wriggler and didn't fall out. U could always pad the bed out a bit by using the top bunk quilt and rolling it up into a sausage shape?
We've got 3 kids. Have asked for adjoining rooms with my parents and they've said they'll take big two but might just move a mattress onto floor. Will see if I can squeeeeze ready bed into case tomorrow