Vilberie is a traditional French hard-cider variety, producing a very tannic but sweet bittersweet juice.
The juice would normally be blended with juice from other varieties to produce a balanced cider.
Like a number of traditional English and French cider varieties, Vilberie is very late-blooming - in southern England or northern France it will typically flower in the last week of May. This can make cross-pollination an issue unless you have other late-flowering varieties available, although it seems to have reasonable self-fertility.
Advice on fruit tree pollination.
Vilberie is an old French variety, introduced to England in the late 19th century.