We had ours in the room with us till 11 months with both of them. 6 months would have been good, but circumstances with moving house and redecorating meant they stayed a bit longer. By 11 months they really were disrupting our nights and being so close to me meant they wanted to comfort feed all night (I fed both till around 13 months).
In the beginning, I wouldn't have had it any other way though. I hated being apart from them and used to feel comforted with them right at my side. In the end, we ended up co-sleeping, though we never set out to do so with either one. It was just way easier and meant I got more sleep, which made the days easier.
My husband found that our kids didn't used to wake him up when they were little babies. I would usually be able to get to them both by the snuffling stage before they started crying as I slept so lightly (and still do I think) when they were born. He also had earplugs in and enjoyed perfect nights' sleep every night! Lucky thing! We'll be sharing our room with this one again this time. We had a cosleeper crib with our daughter, which we'll use again as for the third time, I'm not setting out to cosleep. If this one can seep in its own crib that'll be better all round, but it'll still be right next to me. I can't imagine it any other way!!