Fantastic scene. Modeling looks incredible, and the render is outstanding. I love the details you put a lot of effort into showing; the water droplets on the glass, the carpet, all of the wonderful plants.
In this case, it's a glass material with a slight bump and actual rain geometry in motion with motion blur. In the scene 'Sunday' it was done with two panes of glass, one with an IOR of 1.03 and a normal glass material, the other with an IOR or 1 and some blurring effects along with a bump map. Pretty straight forward, but did require fine tuning.