When talking about culture like this, it is always easy to venture into the ordinary, meaningless differences. But I will provide some examples. Together they maybe form a picture.
Germans have that klischee about being punctual and organized, no? Well, it is true, and it is very different in France. Meetings don't start on time, even in the workplace. But also when you meet up with friends, you don't have to be there on time, and it is seldom expected. It is not as crazy as in Africa or latin america, but if you meet in a bar at 7pm people will arrive 7:15 or 7:30. That was difficult in the beginning. Of course, also happens in Germany, but to a lesser extent.
This translates to other things: I was the first PhD student of my french professor who actually finished his thesis before the deadline. We made a plan, I sticked to it. She fully expected we would run late and was quite surprised. Also, in the international project I was working on, our french colleagues had the tendency to not fully respect the deadlines. That was actually a positive thing, because the deadlines were crazy and instead work was always done when needed, not when the plan saw it fit, leading to a better work distribution.
Food. The coffee is different in France. Meals take longer, also the lunch break does. Entrée, main course, dessert – way more common to have it all. There is a whole restaurant culture in France that is way different than in Germany, with people of the middle class eating in restaurants every week at least once, and with many many more restaurant than in an equally sized german town.
There is also a difference in how people dress. Depends on the place and setting of course, and you can't easily compare Berlin and Paris anyway. But still, it is noticeable also in other cities. There is another standard.
The thing with friends is hard to describe and it also changes anyway depending on age and setting, no matter where you are probably. And I won't go into the topic of women. Something else then: You have in France these really friendly french men who really talk a lot. Very easy to talk to, as they will just start the conversation and help you along, which is quite nice when you meet new colleagues. But in Germany that would mean that someone is really interested in becoming a friend. Here it is just the default for some, it means nothing special.