Hi Frederique,
Welcome in Bubble!
To answer to your questions
I’m French, based in Munich, so yes you can use Bubble in Europe. Regarding GDPR compliance, there is a lot of discussions around that in the forum, you can easily find it…
You have two “mode” when you’re using bubble : Development and Live. Basically you design/code/test in development and when you’re publishing your app when you push it into live mode. You can either use a bubble domain (myapp.bubbleapp.io) or use publish the app to your own domain (myapp.com).
In terms of pricing, you can go to https://bubble.io/pricing. Basically, you pay a monthly fee for each app (but you can also stay at the free tier). The different pricing corresponds to access to different features (for example use your own domain is not possible in the free tier) and more capacity. It’s great to think about it in terms of scalability. Start small and as you grow and have more users/features you can scale your capacity with higher plans.
Webflow and Bubble, again I already saw that in the forum : New Startup, Built with Bubble! - KeepTabs.io
I guess you have to set up your DNS properly if you want to achieve that…
Hope this helps and happy bubbling!