That's in better shape than most. There was claimed hardwood floors under the carpet in my house. It was really wide-plank cypress, like we have upstairs... which would have been fine except that they had nailed the hell out of it (every 2-3 inches along the joists) to get rid of creaks.

In a classic example of scope creep (the plan was to turn an existing room into a kitchen), we ended up tearing them up... and while they're up, let's put in radiant heat piping... etc. I'm so glad we're finally (mostly) done.