When the dses come home, I expect a bit of consideration with regards to comings and goings - ie. if they are going to be in for tea, or if they are out and about, and will feed themselves. And I like to know if they are going to be back really late, or out all night - just for information's sake.
I do get a bit pissed off if they go out, and stay out late, but haven't remembered to take their keys with them!
With regards to their rooms - I don't tidy up after them - if they choose to live in a pigsty, that is up to them. I sometimes go in and have a tidy up and clean once they go back to University.
I do expect them to keep the main bathroom relatively hygienic - dh and I have an en suite, so the main bathroom is theirs, most of the time, and I don't think it is unreasonable to expect them to clean up after themselves.
We don't do the piles of laundry they bring home with them - they have to do all of that, sort it out and iron it etc, but once that's done, they put stuff in the washing basket, and it's done as part of the household laundry.