IKEA Tromso Bunk Bed and Underbed. Notice the Ribba picture ledges to hold books, the reading lamp and the Bekvam step stool to make it a little easier to tuck in the child on the top bunk and make the bed! Love this.
If you're looking for bunk beds for younger children, these are your best bet. We have my one-year-old and three-year-old in these and they are perfect. Not as high as typical bunk beds, plus they feature stairs (that double as drawers) instead of a ladder.