We booked this tour before we left the UK, and were told to be at our hotel reception for 9am. The guide (Rosetta) arrived promptly in a comfortable VW People Carrier. There were six adults on this tour and Rosetta explained where we were and some of the history of the various sights as she drove us round. We 'did' the left bank, the Louvre, Champs Elysees... and so on. There were a few opportunities to stop for photographs, but to 'do' the whole city in a couple of hours there were no opportunities to stop. Having got a handle on the place it shouldn't be difficult to go back.
The tour finished at midday at the base of the Eiffel Tower, where we joined a glass roofed cruise boat for the second part of the tour. The cruise revisited most of the sights we'd seen earlier, but from the River Seine. We cruised from the Eiffel Tower, past the Place de Concorde, The Louvre, Notre Dame... while enjoying an excellent four-course lunch, with wine and live entertainment. The service was attentive, the food tasty, hot and well presented and there was a bottle of red and white wine for each couple.
An excellent introduction to the city.