We are taking our Grand daughter (age 9)with us in December and we have a triple E-1 cabin and my Daughter is taking her other two children ( ages 6 & 12) they are in a quad D-1 cabin. Both cabins have a balcony. A D-1 catagory is as large of a cabin you can get before a junior suite. A third or forth person in a cabin will cost you less money then if you bought another cabin. I don't think you can get a quad in a E-1 catagory cabin. The cabin will have twin beds (put together), a bunk bed that pulls down from the ceiling, and a sofa bed. You don't see the bunk bed when it is up in the ceiling. There is a curtain for privacy. Your cabin stewart will do all the work of setting up and putting away the extra beds. If you want to spend more money a junior suite will give you more space. I've done both and I rather spend the extra money on excursions. Click on the links below and look at the difference. Hope this helps ...
JUNIOR SUITE >
http://lnk.in/3gv3
D-1 CABIN >
http://lnk.in/3gv5