We have a D7 for Explorer in April, will let you know then, unless you will be on Voyager before that?? Have fun. I understand the cabins are very nice, plenty of room to store everything and that the balconies are good size, can't wait to find out for myself in a mere 81 days.
Just got off Voyager and had a D7 cabin. Larger than the interior cabins we wre used to and verry comfortable. The balcony was nice sized and private. For the two of us it was wonderful and we booked the same cabin again for Explorer in December. Plenty of storage and enough room to maneuver.