I've heard that it is very difficult to receive an upgrade from balconies to the Yacht Club, however, for this cruise we hit the jackpot. This was our 1st cruise with MSC and my wife and I fell in love with the Yacht Club.
Our cruise did not go without a few hiccups, but the pluses did out weigh the negatives.
Here were the negatives,
Our stateroom was plenty large enough for my wife and I. Our stateroom was not any bigger then a regular balcony except for the closest and the bathroom . The balcony itself was rather small only fitting 2 small chairs and 1 footrest.