Take action - If you can take it when you are 80% that is what worked best for me!

They had 270+ days to take action, but they didn't.

It's in the main area of the home, and the intention is to keep it as a long-term rental, so I agree that addressing the issue might be the best course of action. 

@Chris Johansen There’s a few action items you should take care of to protect yourself from construction related liability.1.The Builder should maintain commercial general liability and professional liability insurance 2.

One of the reasons why I’m bullish on real estate investing is because I am more afraid of the “what if I didn’t invest” rather than the “what if it goes wrong.”Yes, I could fail and lose everything I started with, but I’d still be farther along than if I never started at all.I’d have the knowledge, skills, and lessons that only come from taking action.Every misstep is a step forward when you’re learning and adapting.The real risk isn’t failure, it’s standing still and letting fear hold you back.Take action!!!

What you want to discourage is the tenant 'helping' you with feedback/action that is outside the scope of the lease.  

Cabins are sitting on the market for a long time with little action.

Highly recommend you start listening to any of the BiggerPockets Podcasts and pick some various topics you may be interested in and see how you may be able to take action, the most important thing you can do!

Take action (start when you are 80% ready!)

No one takes action based on an online course, they take action because of networking within the community of the course.