I was in one of the Studio rooms and found it to be well-designed and comfortable. One issue I had was the shower. It seemed as if the hot/cold water was constantly fluctuating, but that wasn't a huge issue. The Solo Traveler meetup was a blast, and people were very friendly. The Cruise Critic Meet & Mingle was also fun!
Check in - Staff was friendly and helped us to get into our Staterooms ASAP.
Food - we had Ultimate Dining, and my favorite was La Cucina. I didn't go to Moderno, but my family didn't care for it. At Cagney's, we told the supervisor that our mother was sick and couldn't leave the cabin, and she had a meal sent up to her! Above and beyond! All of the service in the restaurants (including Manhattan Room) was great! I would like to point out that the service is friendly and casual, not stiff and deferential. Make of that what you will.
Was perfect for one! Had no trouble unpacking. It should be noted that Studios don't have refrigerators, but the ice bucket was always stocked.