Welcome to Cruise Chat.
Is there any reason you wanted the adjoining rooms? If not, then I would call my agent back and defintely request a handicapped room, of course the cruiseline will want verifications as to what type of handicapp you are dealing with, since there are so few of these rooms on the ships.
As far as the cabins being close together, that really shouldnt matter, most times people meet in the public areas, you also have phones in each cabin to stay in contact with each other. I would call my agent back and ask these questions especially how close the cabins are to the elevators. Keep in mind that the lower you are on the ship, sometimes the better it is to get an elevator..since most people want to go up..when the elevators come to your deck they are usually empty, its those on the higher decks that have to wait at times because the elevators might be full by the time it stops at their deck.