My girl Hattie was 2yrs old when we got Darcy, she used to sleep, in the dinning room but also had a bed at the top of the stairs, when we got Darcy we put his create in the dinning room, but we found Hattie kept disturbing him going in and out the room. So we decided to put her in our bedroom in her create ( which she loves), Darcy is now 1 yrs and over the last 3 weeks they have both been left together in the dinning room with out any problems.
I think it is just trail and error, some dogs settle well straight away, others like mine can take a little longer, just do what works for you, even though i did not really what Hattie in our bedroom, i knew (hoped) it would just be a temporary move and eventually they would be downstairs on there own.