Crate and Barrel grey couch/sofa. Width about 76 inches, depth about 36 inches.
In terms of the design and dimensions, it's close to this one.
https://www.crateandbarrel.com/petrie-midcentury-apartment-sofa/s106373
It does have a few stains and some wear here and there, but it's overall clean. It's really comfortable, and you or a friend can definitely sleep on this.

No flaking please!
I live in Oakland.