Like New Casper queen memory foam mattress. It was used lightly in our guest room for maybe 10-20 nights in total. Always had mattress protection on.
Selling only because we need our guest room for one of our kids. No stains, no smoking. We are the original owner (see Pic). Bought for $1,100 delivered, asking $350 (you pick up, I help load).
Also selling a sleek Zinus steel platform frame (separate listing https://www.craigslist.org/view/d/seattle-casper-sleep-original-11-memory/vxYM8Tb9LWCq1bjW8NR76f) to match.