Traveled with two other couples, all wanted to see Alaska and Celebrity offered a good package that included beverages for the same cost as Royal, where we have done most travel.
As others have noted, the Celebrity website is terrible. I can get more information more easily on Carnival, for heaven's sake. Make sure you print everything out and be prepared to carefully review at check-in.
Embarkation was relatively easy. The port is north of downtown Seattle while the airport is south. So you're going to have some transportation costs. Downtown hotel, figure about $300 per night. We stayed by the Seattle Center.
Typical size, balcony provided privacy. two idiots next door whose woke up early on port days, seemingly amazed that their cell phone worked. so they turned the speakers on and shouted away to whoever it was who could bear to listen to them.
And the room attendant told me to put my dirty dishes in the hallway.
Best deals on t-shirts compared to the ship or local tourist traps.