What configuration did you book? A triple or a quad? If you know the cabin # you are looking at, you can go to the deck plans and look to see what beds it has. If you have a little more info, we can say what the extra bed(s) would be. There are triples with two twins and one convertible sofa, or a quad, with a convertible sofa and a upper bunk.
The inside is 185 s.f. and the OV is 220 s.f. on conquest. You will have a sofa in the OV you dont get with the inside. (the sofa may be a convertible sofa though, if thats what a 3rd person is using for a bed).
Iv used Holiday Inn Superdome for $99 twice that has free cruise parking. I have also used the Drury which is very nice and includes a free happy hour and good breakfast and just have the best rooms, and they have parking cruise package usually for $35 for parking, though it has gone up and down a few times. Both hotels are on the outskirts of the French Qtr, so you can walk around the qtr the night before.
Iv done Conquest 4 times and have it booked again, so if you have other questions, ask away.