Hi there, @Luca_Gentile and welcome to the Community 
Thanks for adding your idea to the Wishlist!
We can’t promise that this app will be released. However, if more users get interested in this app, we’ll try to think about it in the future 
As for the GetYourGuide reviews, you can manually add them and display in our All-in-One Reviews app:
If you’d like to automatically collect the reviews for your source, please upvote this request - GetYourGuide auto importing reviews