Allow adding notes to booking calendar

It would be great to be able to add a note (to self, or to cleaners) to the booking calendar. For example "Stove repairman coming today", "Call maintenance", "Don't forget to call Joe", "Guest checking in early today", etc. Adding a note to a booking would not suffice, needs to be something that you see when you look at the monthly calendar or the ribbon. Of course, it should be something that doesn't block the date from being booked.

With the ability to restrict access to seeing it!

Yes! I am hoping to have this feature too! 

I think there is a better overall solution to cleaning calendars that solves this problem  --- implement a "Calendar invite" which can be triggered by events such as departure date. This would allow cleaners to have a single calendar with events from multiple properties. It would also allow you to add individual ;notes for any calendar event. My cleaning service has this with owners who use other PMS software, and she is unhappy we cannot do it.