However, if you want to be generous and build a good relationship with the new owner, giving them for free could be a nice gesture.

You are much more generous than me.

Having said that, I have interacted with Chris Seveney on many occasions and have found him to be an upstanding guy who is very generous with this time, knowledge, and expertise.  

TIA, and thanks so much to this community for the generous sharing of knowledge.

Integrity goes a long way.You can also give a very generous closing gift, offer additional information/services post-closing, and/or offer a rebate for a portion of your commission at/near closing time. 

It's an offer, I think a generous one.   

I've been so generous with them so in the end hire a property manager and be very firm with them, lessons learned.

As I can't quite tell if the cleaner did not fully restock (I ask the cleaners to be generous with the restock), I'm leaning toward covering all the extra charges ($300 worth if I include the extra time our hot tub maintenance person had to put in to restore the tub/water) but leaving them a 3-star review, knowing they may push back in their comments. 

They are heartbreaking because he can be so generous and thoughtful and a hell of a lot of fun.

We are so lucky to have this incredible resource and generous community of like-minded folks.