Addressing Guest's issues

[Matt Devincenzo]

I do furnished monthly stays, and have typically had happy guest. But I just had a guest check out early after staying 10 days in a 30 day stay. This was the first I heard of any issues, and unfortunately one was self induced...I usually don't do same day turnover I typically keep a buffer due to longer guest stays. This time the guest requested the earlier day and I accommodated, but my cleaner was still there when they arrived and I think may have hurried to finish resulting in part of the complaint though she said she had finished. I haven't received any other feedback like this from prior guests:

Just wanted to let you know that I vacated the property. It was too uncomfortable for us. The beds were too hard, the backyard neighbors were squirting my dog with water, sirens all day. Also, i want to let you know that the cleaner didn’t finish cleaning either.

So for the experienced operators out there how do you address something like this? I have another guest after this one's stay was supposed to end so I can't book those days. There wasn't a refund request, but from other posts I'm guessing she can likely get ABB to give her one if she asks...

[Mike Grudzien]

Quote from @John Underwood:

I would apologize and refund their unused days and hope they don't leave you a bad review.

Always check in with you guests the day of or next day to make sure everything is alright.

 I agree with John.  And I'm old school.  
I personally call the guest within 24 hours of booking to thank them, ask if they have any questions about the property and ask if there's anything that I can do to prepare for their visit or enhance their stay. 
Then I send them a welcome message the week prior to their arrival. 
I meet and greet at the time of arrival (this step can be skipped for remote properties, but I live next door). 
Then I check with them the day after arrival to ask how was the first night, was there anything that they need or is there anything that the house was lacking.  Then I check with them on day of departure, in the morning, again to ask how everything was.
Along along the way, from start to finish, I let them know that I'm available 24/7, just a phone call away.
Yes, I'm OCD, but my average rating (100's of reviews) is 4.98 for 11 years...