We kept all of our 3 little guys in their cradles in our room until they just got too big for them! (3 guys at different times-- ages 4 1/2, 3, and 8 mos-- NOT triplets!!) (About 3-4 months) We did invest in one of the really great video monitors for the baby room though, one with night vision, so we could watch him from our room at night and check on him! It brings great peace of mind to be able to hear and see every little thing (also keeps you from rushing in there at every sound made-- so you know when he's just making sounds in his sleep or if he's actually awake or needing/wanting something!).
We did start from day one letting him take his naps in the crib in his room though-- just so he would get accustomed to being in there and being comfortable in that room and in his crib! Worked great all 3 times for us!!!