For two people, there is more than enough room to pass each other and store your bags, trinkets, etc. There is a large bed (a Queen I think if you asked for the two twins to be together), and a couch(apartment sized I'd say) with a coffee table infront of it, and two bed-side end tables. There will be a TV on the dressing table/mirror/safe/stereo/hair dryer thing, with many drawers for storage. There is a rather large sized closet for hanging clothing and suit case storage. The bathroom has a full size sink and table with a huge mirror and shelfs, a toilet, and a stand-up shower(no tub in the standard D-1 and D-2 balcony cabins), and the shower has enough room to turn and stand with comfort. There is a curved shower door which adds to the area.
Since you've been crusing, I don't have top remind you to Not Over Pack! You should be fine0oh yes, the balcony has two chairs and a small table, and a GREAT view of everything you pass!!