I think that's GREAT! That will make your stay in Vancouver so much easier. Just be sure you pack whatever you may need in your carry-on; in particular, your cruise documents, medications, a change of clothes, and all valuables. Since you booked the air through Celebrity, they will take care of everything for you. And the city tour is still a good idea. Hospitality rooms are a nice gesture, but they can be pretty boring if stuck there for 6-8 hours.