This is our 2nd tour with Marianne, whom we consider a friend. The day before we did basics not needing a guide (Tower, Arc, boat, etc). We got in-depth insight for Ste. Chapelle, Notre Dame, Sorbonne / Latin Quarter, P. de Luxembourg, Invalides, etc. from Marianne, which makes a big difference in seeing Paris through a Parisian's eyes. Buy 2-day Paris Visite transit ticket + RATP, NextStopParis, & online map apps. For time, use Uber if a bus connection or walk is too long. Great lunch & tour!!