I have had many holidays with different friends but always have my own room. If a group of us go a couple do share but the rest of us like our own space. Luckily we all get on and are open. I did share twice with the same friend, years ago now, we had been friends 25 years, I am a light sleeper and her snores could be heard rooms away, then on waking she would go in the bathroom, lock the door for an hour, the shower ran for at least 20 minutes, meanwhile I was awake dying for the loo. Then at meal tines she would tell me about my calorie intake and the food I ate, she objected to me having wine with a meal, she kept her figure by eating small meals as we didn't burn the calories, foolishly I did another holiday with her as didn't quite know how to get out if it but never again. Look back and can't believe I put up with it.