@Adrienne174 Best to only review the booking guest. There have been cases where the guest was having an affair- their "partner" was not actually their spouse (wife or hubby was supposedly on a business trip, etc), and the guest would be upset if the other party were mentioned in a public review.
If it's quite obviously a husband/wife couple, of course you could say XX and YY were lovely guests.
If the other guest was objectionable in some way, you could send private feedback about that to the booking guest.