Instruct: Classify the given Amazon review as either positive or negative.
Query: Nice mattress!

Purchased the queen size sleeper sofa replacement mattress, and though it took a little time for the item to ship and arrive, it was definitely worth it. The replacement mattress is far nicer and more comfortable than the original that came with my sleeper sofa. The dimensions are just right, and the mattress even came with a free set of sheets!