We will stagger new wood into existing floor. Then will resend and refinish the entire floor. You won't see any difference!
Almost every types of flooring can be damaged by water, (even though there are some water proof floors, like LVT). The water can damage the sub floor too.
The repair depends on how big is your sub floor damaged. We can replace the plywood also the damaged wood under.
We can level you concrete floor in order to install the hardwood on top.