The administration knows you by name, and are very genuine about the nature of Georgetown. Ms. Sullivan sets out to paint the Georgetown picture for the applicants. By the time of the interview, you are armed with good information. The Georgetown interview is definitely the most informative of those I've visited.
What impressed you negatively?
Traffic in Washington. The financial aid presentation warned against relying solely on loans, but did not offer a plausible alternative for students supporting themselves.
What did you wish you had known ahead of time?
Apparently, calling the Metro "the subway" is a good way to brand yourself as a tourist. Be warned.