If I'm allowed to go to bed late I can usually sleep when away (with the help of meds). The bed itself doesn't matter so much but I don't sleep well at one relative's house because there are virtually no doors. I want to close the door and trap it with something that makes a sound if someone opens it.

I'm only comfortable sharing rooms with a few people in my life.

Sometimes I sleep better at another relative's place than at home because it is so quiet where they live, I live in an apartment and there are always some sounds like water pipes, cars etc.