Our server for 15 nights was Daniel from United Kingdom. When we sailed in January he'd only been on the ship for about 3 months. But he was absolutely fantastic. We couldn't have asked for better service. He's on track to become a head server and took on that role during the breakfast/lunch service in the restaurants.
Daniel's assistant, Jorge from Columbia, had only been on the ship for a month and was still rather reserved and shy. But by the end of the cruise he seemed to be breaking out of his shell some. Still he was quite attentive and kept our drinks filled, bread & butter on the table, and replaced forks, spoons & napkins regularly. (The kids had a tendency to drop/spill a lot.)
Another server we had quite often, for breakfasts and lunches, was Terry from England. I think he's been on the ship for about a year now and just recently (shortly before our sailing in early January) got promoted to server from asst. server. He took great care of us, especially DD who is a picky eater.
We never actually had Sandra from Peru as a server, but we saw her a lot around the ship and she was always friendly and helpful.
We had Nikola from Serbia for brunch in Palo. He was very good, very attentive.
BTW, our DD3 came off the ship with 2 boyfriends - Daniel and Terry. I don't know whether it was the Brittish accent or the fact that they both doted on her, fed her, and kept her enterained. But she still comments almost daily how much she misses them. And both DD3 and DS6 have requested that our next vacation be on the Mickey Mouse Cruise Ship again, the one where Daniel is.
Every night dd would put up a stink about eating and yet some small talk and a smile from Vitor somehow made her hungry. He actually fed her almost all of her food every night! I have to admit I miss him too as it has been a week since we got off. The kids keep asking if we will see them again. 
