Welcome to our world! But please realize that recommendations are going to reflect the tastes of those recommending.
If you're considering a one-week cruise, I'd recommend Holland America or Celebrity; both have good food and good shows. I think Celebrity does better at the troupe shows and HAL does better on the individual entertainers, but on any given trip you can hit something outstanding or a real dud, depending again on your taste. Likewise, if you equate "good" food with "gourmet" food, you're probably going to be disappointed on anything other than the luxury lines.
HAL's cabins are generally larger than other lines'. Celebrity's repeat-passenger program is more generous.