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I have 3 dcs and out of necessity 2 have to share. For ages when dd was younger she shared with her brother because they got on better and had similar sleeping habits. We only swapped and put 2 boys together when ds2 reached an age when we didn't feel it was appropriate for him to share with his sister. When we just had the 2 ds they shared a room anyway and we used the other bedrooom as a playroom/spare bedroom for guests. I'm all for what ever makes your life easier and if that's having your dcs share then go for it.
My son and daughter are almost 4 and 2 and happily. share. In fact dd, has never slept alone (first 6 months in our room then straight in with ds). It also means we get to have a spare room for the time being.
Mine (dd and ds) did this between ages of 2/5 and 6/9. Worked fine, they comforted each other through nightmares and scared-to-go-to-sleep and had lots of fun. We only moved them when dd started getting towards pre-adolescence and needed a room of her own where she could take her friends.
If they both sleep well, can't see a problem. Mine share and sleep through each other's teeth grinding, screaming, snoring so it's worked out fine. If you have light sleepers might be more of a problem. I think it's a nice idea, they prob feel more secure with someone else there and it frees up a spare room for guests/rubbish you can't find a place for.
I have 9 year old dd and 6 year old ds. They have their own rooms but dd is lucky enough to have a double bed. I'd say at least once a week (usually at the weekend) they both sleep together in her bed and it looks so lovely to see them together. She reads him stories before they go to sleep. DS always sleeps longer when he sleeps with her. I don't see the harm, when they get a bit older they'll be excited to get their 'own space' so go for it for now
I have a girl of nearly four and a boy of two, they play well together 90% of the time, my daughter has not enjoyed going to sleep alone for quite a while (infact probably since brother arrived)! I have been wondering about them sharing a room, when they sleep together at nannies or on hholiday they love it and lay in in the morning. Any opinions or advice??
However, since the very light nights have taken longer to settle. 
