Arrived home last night from our Christmas cruise around the Med. The Costa Diadema is a beautiful ship, a pity it isn't owned and run by Celebrity or Royal Caribbean. Our inside cabin, 2269, was comfortable and spacious. Part of the cruise experience is good food, unfortunately not on this ship. The food was awful, the only thing consistent was it's temperature, cold or tepid. The dining room was practically empty, which says a lot. My Christmas Day lunch was hamburger and chips, the evening Gala Dinner menu was mostly variations of fish. Our waiter forgot one course of my meal and then brought me the wrong main meal, when I pointed out it wasn't what I ordered he argued with me. The 26th December we settled down for our meal in the dining room, read the menu and promptly left. We ended up eating buffet food next to the swimming pool, totally over dressed. The food in the buffet was luke warm with the same choices every day, and the waiters slow to clear tables. The entertainment in the theatre was just the crew or ship's dancers, but we did find the groups around the various bars and lounges good. A huge ship but never felt overcrowded as there was plenty of seating area's to choose. We didn't take any ship's own excursions as English was the fifth language to be translated, which tends to grate on your nerves after a day or two. No, never again with Costa, we shall only book with Celebrity or Royal Caribbean in future. So that's Christmas 2016 finished for us and we was so looking forward to it.