We (self 60, DW 57) last sailed on Liberty in 2008. I'm happy to say that she still looks as beautiful and well-kept as she did 5 1/2 years ago.
We had a Promenade Inside Cabin (6283). I always wanted to try a Promenade room. The last time we sailed Liberty we had a standard inside; I believe a standard inside has a bit more storage space than a Promenade cabin. This was a five day cruise for two adults. There was certainly enough storage room for two (especially with suitcases fitting under the beds, but it was less storage than we're used to on Royal ships (we've done insides. OV's, balconies).
Food: Our last cruise 4 months earlier was on Disney Wonder. For all you hear about Disney food, we both found the Windjammer Buffet to be superior in both choices and quality over the Disney buffet area. I personally enjoyed the Royal dinners more than Disney, but that's a very objective matter. I've read complaints about cold food on Royal: we never had a meal anywhere that wasn't served hot. The Dining Room on Royal is a great lunch choice on sea days; they have a superb salad bar as well as several daily choices. We didn't do specialty restaurants or Johnny Rockets ($4.95 cover charge, but we cruised when JR was free and saw lots of wasted food, so I find the price justified). The Promenade area had pizza, sandwiches, desserts all day.
I think there's a bit less storage than you'll find in other Insides (cabinets on the sides of mirror are almost useless), but enough for two people. Suitcases fit under the bed.