Two-Mattress Sleeping Structure With Ladder Access

Puzzle 7 of Secondhand Treasures Pack

Question is: Two-Mattress Sleeping Structure With Ladder Access

and the answer is: BUNKBED

Word Meaning:

BUNK BED — A type of furniture with two or more beds stacked vertically, one directly above the other, in order to save floorspace.

Definitions from Wiktionary.