Well we didn't train him to sleep there, she just took him to bed with her from the very first day we got him. And he's such a sleepy head he sleeps all night long.
I've always let my babies sleep with me for well over 25 years with no mishaps so far, thankfully.
My daughter has made a makeshift stair which Binks can use if he needs to go potty on the pee pad, which he has only used a couple times when we have slept later than normal and he can't hold it.
But I'm sure that a pup would be happy whether you start them out in a crate or in the bed, I think its just a matter of what they get used to.
My neice is crate training her little Shih Tzu and the pup seems happy with that because thats what shes used to.
Now as for the potty training during the day, we're having a harder time lol.
It seems at night when he's shut up in the bedroom he don't want to mess the carpet so he goes to the pad, but during the day he don't care to mess the rest of the house.