When we were on the Mariner we had the same cabin as yours except it was on the opposite side from 7388. Here is a photo of the aft end, which should be similar to what is seen on the Explorer. Aft End of Mariner
Those corner balconies are huge, easily 120 square feet or so. You have a large round opening on the side with unencumbered views. Noise and smoke are not a problem. It was the best balcony we have ever had.