I brought Riley home at 10-weeks old and he has been fine.  I was really amazed what an easy pup he has been.  I am constantly telling people how I really lucked out and how blessed I am.  He is totally laid back and chill.  He's also a Major City Boy and goes just about everywhere with me.  
 
 
I did send a Snuggle Puppy to the breeder to get mom & dad's scent on it.  And, he still carries it around from room to room.  His breeder had several females and one male and they would have company come over to socialize with the pups.  That could be a huge reason why he has been such an easy pup.  He turned 1 year in May, this year and has had full run of the whole place, night and day since about 9-months old.