Great views. First, take the elevator to the 56th floor, there are views of Paris, with signs on the floor that you can see, then walk up the stairs to the roof. There are views through the glass too, but outdoors. There is a place to sit and where to take a picture. The ticket for an adult is 21 euros, you can buy it on the 56th floor.
An iconic place in Paris and the view from the observation deck above of Paris is no worse than from the Eiffel Tower. The height of the tower is 210 meters - it is 60 floors. The tower was mercilessly criticized (and continues to be) by architects of all stripes and even officials. It is the only skyscraper in the city center and according to the decision of the mayor's office, nothing like this will be built in the historical center)