Looks like Jasminum polyanthum to me which is interesting since it normally blooms in late winter/early spring.

http://www.guide-to-houseplants.com/jasmine-plant.html

But that is pink jasmine, having pink tint.

The plant does bloom in late winter. I searched the web and someone else has the same plant. But he/she says it is night blooming jasmine. But it appears night blooming jasmine looks somehow different....

That explains a lot! I'm definitely going with Jasminum polyanthum if it bloomed in the winter.

Common names can be confusing, that's why I like botanical names. Night blooming jasmine to many people is actually Cestrum nocturnum which isn't even a jasmine.

It looks like Jasminum officinale, Poet's Jasmine.

It is hard for me to tell . I happen to have have both : jasminum officinale and jasminum polianthum and the flowers look more to me like Poet´s Jasmine (officinale) and yet the foliage looks much more like Polianthum . The flowers my polianthum produces, without being completely pink are not white as this one.

I think it's Jasminum azoricum, because I have one, and looks like this.