Here's another 1 minute test with the smoothing problem solved and and a bit better lighting:

Thanks for all the comments and help guys.
ps. When I use a higher render resolution the fireflies in the windows (glass material) are more noticeable, and seem to take a lot longer to clean up. Are there any tweaks or special settings to take into account when rendering transparent glass? Is there a way to make it similar to "architectural glass" and therefore faster to trender?
