it's a queen size but you have to be careful on ordering the mattresses because I do not think you need a box spring for this bed however you might want the extra support another thing there's a little space around the edges but if you have a nice fluffy comforter you can't really see and I use the bedskirt so that covers the gaps nicely if you going to use a boxspring the headboard is going to be taking upby the mattress she won't be able to see much of the headboard

Pros: very very easy to assemble It's durable
Cons: there's a few spaces around the mattress but it could be easily fixed