Does this bed need a box spring?

No. It is a foundation bed, so a queen mattress sits directly on the frame. A box spring would only raise the mattress height.

What mattress size fits it?

It takes a standard queen mattress, 60 by 80 inches. Any queen mattress, foam or spring, should fit.

AFI lists it as a solid wood frame. Expect real wood rails and slats rather than a metal platform.

It ships flat and needs assembly with basic tools. Two people make it easier because the wood pieces are heavy.

Yes. It is a standalone foundation bed, so it can sit against a wall or pair with a separate headboard.

At The Home Depot, for $421.34, as of our latest check.

$421.34at The Home DepotChecked Nov 8

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