We live just outside Southampton so it was really easy for us. No limit on the luggage and easy check in at Southampton Cruise Terminal. 1st cruise for us aside from a Nile cruise and decided to go with Celebrity for convenience. We purchased the all inclusive package and paid the tips upfront, tips £220 or thereabouts for 2 persons - the all inclusive package is limited to certain drinks but so long as you only choose from the options in the package you will not have a large bill at the end of your holiday.
Our room 6303 had a balcony which was really nice, and as at the back bigger than the standard balcony. Lovely decoration, comfortable bed and we had plenty of storage space.
Main restaurant Moonlight Sonata - if you elect to pay gratuities up front you can have flexible dining option which means you can eat when you like, - if you do not you and elect to have fixed dining you will have to choose an early dining option or a late dining option. If you are flexible you can sit at different tables if you are fixed you will likely dine at the same table at a fixed time. Waiter service and you can have anything from Snails and frog legs to fillet steak.