Our current two, Cheli (French Bulldog) and Lambeau probably will not have free roam as they can not be trusted together... too much mischief.
Our first two, Nitshcke and Banks were free during the day at age of about 2 yrs.... we slowly gave them the house over a few weeks. Both were trusted the rest of their lives and they slept with us from about the age of 8 months. However, we never took the crate down/away... we removed the door (stored it) and they would still use it when they just wanted to be alone for awhile ... chew a bone, take a nap or just to chill. we trained them that it was their 'safe' place and when they were in their crate we did not allow the other to bother them and we also did the same... never touched them when in the crate that was their down time.
On the safety note... it is always best to crate them when you are not at home.