Well the timelapse of the view out of our hotel window worked out pretty well. The timing was good, as it started shortly before sunset and continued just log enough into the night to capture the arrival of the snow that obscured the view. It's now snowing steadily.
Avoiding reflections is always an challenge when photographing through a window at night, but by far the biggest offender was the camera itself and it's stupid blinking red recording light on the front of the camera near the lens that doesn't synchronise itself to avoid lighting up while a timelapse frame is being taken.
