We have DS (18months) in his cot in our room next to the bed. Works for us. DH often ends up in the spare because I snore but generally we sleep together. I have recently thought of getting him into his own room..........seems like too much hard work.
My cousins family had a "nest bed" on the floor for their family and they all slept together for about 6 years. I think it was only when their kids went for sleep overs and cottoned on to another way of sleeping that the kids led the move to their own rooms.........
I reckon I'll be OK for DS to move to his own room when he starts bringing his GF home for the night!