The meeting point is NOT at the Eiffel Tower. It is located on the steps leading from Pont d'Iena to the river. The steps are by the carrousel on the end of the Pont d'Iena just in front of the Eiffel Tower (on the right when you are facing the tower from the bridge).
Conclusion Point: 2nd Floor of the Eiffel Tower
You can cancel up to 24 hours in advance of the experience for a full refund.
It is a tough climb for people who aren't in decent shape but the guides do good job of letting people catch their breath and legs, stopping at the different platforms.
The Description of the Tour Is not clear enough, no fast lane, no summit possible, hours of waiting, not to recommend.