Where should my baby sleep?

Most parents when their child is first born like them to sleep in the same room so they can keep an eye on them, this is what we did. As much as I said I would never have my son in the same bed, he did occasionally sleep with me. Sometimes Keegan just would not settle and I think all he sometimes wanted was a cuddle off his mum, I never put him next to his dad though as his dad is a smoker. He is now four months old and I dont think I will be doing it again now as I dont want him to get attatched to sleeping in our bed.
I out him up in his own room after about 6/8 weeks as I wanted him to sleep on his own as soon as I could. He did brilliantly straight away and sometimes even went 12hours from 9pm til 9am. Even though we got a good nights sleep I really wanted him to sleep hours such as 7pm til 7am. This was more difficult than I imagined it would be. Because I had disrupted his sleep pattern he decided to disrupt ours. We were back to square one and he was waking up at 3am wanting a feed. As much as I wanted my sleep I refused to let him get the better of me and persisted to get him to sleep the hours I wanted.
Even though it felt like longer, it only took about a week for his body clock to get used to the change. I think it also helped that around this time I put him on to solid foods during the day and he was in a routine with a bottle before bed.
Now I can happily say that Keegan is sleeping from 7pm til 7am and is just having about an hour nap during the day which is enough time for me to get things done around the house if needs be.