We have a Queen Size Ikea Nesttun bed for sale, with a Luroey slatted bed base, and a Haugesund firm mattress.
The bed and mattress are three years old, and have been used about half the time.

https://www.ikea.com/us/en/p/nesttun-bed-frame-white-luroey-s89158030/
https://www.ikea.com/us/en/p/haugesund-spring-mattress-medium-firm-dark-beige-80307416/

Bed frame and mattress originally were $199 and $249 respectively.
Asking $300 OBO for both.

We are in downtown Palo Alto.
From a pet free smoke free home.