The old tricks will get you hammered.

Is there a sneaky reason why the tenant is advertising it for hundreds more each month?

The trick is cash flow. 

That doesn’t always work but if you can get them to agree in writing to terminate the lease and vacate with no further legal or financial penalty, sometimes that does the trick and is much easier process for both parties.

The trick is, asking the right question!

I don't know for certain, but I imagine that refinishing and sealing should do the trick...this is good question for a knowledgeable hardwood contractor...

For example, I acquired a property in Phoenix to fund my purchase of a vacation home up north to escape the heat.I'll buy another property to afford my tricked-out WRX STI in the future, and a third one so I can take a European vacation every year with my family.I agree with your decision, but consider rewarding yourself again once you have more comfortable cash flow and there are more predictable signs of the direction of the economy and REI legeslature. 

Here is my boilerplate list of the steps you should take to learn how to estimate rehab costs:#1 Read the Book on Estimating Rehab CostsExpert house flipper J Scott discusses the fundamentals of budgeting and pricing rehab costs and reveals the steps, tips, and tricks he uses to accurately estimate costs for 25 common trade categories and hundreds of repairs.

So I'm fishing for tips and tricks I guess in that area. 

A great trick I learned for curbing credit card use is to put one in a ziplock bag, fill it with water, and freeze it.