You request for someone to make this switch, would be very surprising if it happened. The aft has become so popular, they are usually at a premium, and, at a premium price...Midship is the comfort zone for many, and, forward gets a bad rap in many cases..I sailed the Med last spring, and had a forward cabin,and had not one issue.
Good luck,and have a great cruise.
Trip, with her book & tea!
Chat Hostess & Board Moderator