Balance the sweetness of the berries according to taste, adding more or less sugar to the syrup as you prefer. If you like the contrast of sweet and sour, keep the berries 'tangy' by reducing the amount of sugar. Conversely, if you want a really sweet cake add more sugar accordingly.
It appears that one of the first cheesecakes was made in Greece for the Olympic Games, and was offered to the athletes before competition. Today, however, the cheesecake is known as an Anglo-Saxon specialty, particularly American.