No country is referred to as 'The Heaven of Europe'.
Italy
Germany
That's not a complete sentence. Barring that, the answer to your intended question is France.
Hungary. The Netherlands is also sometimes referred to as 'Holland'
The reference was to Italy .
The Workshop of Europe (and the world) was a nickname given to the United Kingdom. Its capital is London.
The capital of the country known as the breadbasket of Europe is Kyiv, the capital of Ukraine. Ukraine is often referred to as Europe's breadbasket due to its fertile agricultural land and its status as a major producer of grains.
Detroit is the Motor City.
powder keg of Europe
It would have been considered to have been an east European country.
The Balkan Peninsula.The Balkans were referred to as the Power Keg of Europe.