Currently it's not possible to see who last changed a certain property.
It would be great to have an overview of changes to properties - not on a contact/company/deal level but on an organisation level. I had a change that nobody would admit that they made and we had to contact HS support to figure out who made the change.
We also need this. I need to see who is making changes to the property settings in HubSpot and when the changes are being made. There is currently a way to Export Property History, but this only shows the history of the property within the object, not the history of the property's setting.