DH and I have been discussing DS1's (10) room. I am quite happy to let him have it neat or messy, what he wants on the walls etc. DH thinks he should be made to tidy it. I see it as 'his' space. As long as he follows the three rules we have in place (which he does) I dont mind.
I have to say that I think my feeling on this come from my own Mum who was the total opposite of me. When we were children she would quite often go off in massive violent rages if our bedrooms were not tidied to her satisfaction. Throwing things away and shouting and screaming. I suppose this has made me more laid back.