@Ellie96
If you trust the neighbor, I would simply say something like "Guest was nice and took care of the place during her stay. Guest hosted quiet a few friends in the evening hours and our space might not be the best fit for her in the future."
We hosted a couple last Christmas when we were still new hosts. They were nice enough and had family who lived locally (which we now see as a bit of a warning sign). I showed up to clean with my toddler in tow and it was clear that more than 2 adults and one child slept there- -it was 11am and the guest's mom, cousins, and brothers were all pulling their suitcases our of the apartment and getting into their cars! The whole family had a sleep over for two nights. But did I have real PROOF other than relatives leaving the apartment? No. Maybe they just came for morning coffee with their bags.
So I tiptoed around it in my review and stated that while they were nice,
*"I wish I had known that SO many local extended family members would visit so I could have provided enough supplies and ammeneties for them all". * This was too soft of a review and super passive aggressive but it was what I could muster at the time and it made me feel a little less miffed.
To top it off, the guest didn't leave us a review AND his brother contacted us through AirBnB a month later asking for $800 for tow fees because he had parked illegally while secretly staying at the AirBnB.