Trocadero is one of the most popular places to take photos in front of the Eiffel Tower. It has sweeping views of the city, a variety of spots to pose and if you turn around and look back at it, the buildings in Trocadero have a lot of bold architecture too.
I advise getting there as early as possible (sunrise!) to avoid the crowds and get the best light.
Update 2021: Trocadero is temporarily closed as a massive renovation project is underway. I’m always checking up on this location to see what kind of possibilities we have. Feel free to get in touch to find out what we can do for your shoot.