Thanks for checking this one out guys!
The plant is relatively small - it has several (4/5) smaller fans in various sizes popping up. Here is a size comparison:
Taken next to a beer bottle
It did get a significant drop in temps, and the sun angle does change during the winter so we get a bit brighter sunlight (on the days we get any sun) which I think did the trick. It's potted in a plastic cup in a mix of perlite and fine rock, and is grown dry (watered once 1.5 weeks) in the winter, although more wet in the summer.
I'm surprised that it bloomed; I think these ones don't mind it a bit sunnier and drier. I've had it for about 10 months now, so I'm still waiting to see how well it grows this summer. Still learning how to take care of this one!