Congrats on your upgrade. I am very sure that you'll not regret it, and despite what you said earlier, getting a little further away from the pool and joggers makes me more comfortable. Wait until you see how big your balconey is. I bet you will end up eating breakfast on it more than once if the weather cooperates.
When you order room service it is from the regular room service menu, or if it is meal time you may also order anything (or everything) on the regular restaurant menu. Your butler will serve it in courses, just as would occur in the restaurant, unless you prefer it all at once. If you like, you can also have a standing order with the butler for coffee, juice, danish, etc every morning. Or, you can have a standing order for an evening cocktail. It's all terribly ritzy and my wife and I love it. You tip the butler exactly as you would your cabin steward and waiter, at the very end of the cruise. And, they publish suggested amounts on the celebrity website, in the FAQ's. I believe, but you should check, they recommend $3.50 per person per day.
If you need things pressed, there is a normal dry cleaners / laundry on board, but no self-service facility. There is a nominal fee, about what you would pay at home. Some people pack a travel iron, but we never do. Careful packing has been sufficient for us. By the way, the butler will also assist in unpacking if you desire.
And SusyQ, don't get concerned about the number of questions you ask. It is the reason this board exists. And if people like us tired of them, we simply wouldn't answer.
Ted