I don't know CC3, but for the road, my understanding is that you would use a sheet effect(or is that layer effect). Not sure about the walls. One issue I see on the wooden ones is due to the bevel effect being used(which I tend to suggest not using). It's not "super" noticeable, but if you look closely, you can see it fairly well and it looks a bit odd.
Also, a few of your doors are askew, and the aliasing on them looks odd(the three on the top of the main hallway to the rooms.) Even with all that said, it's still a fairly nice map... I am sure someone will stop by shortly to give you specifics on CC3/DD.
Personally, I use GIMP and this map would be fairly easy to assemble there given the same components.
EDIT: you might want to scale down the chairs a bit, the seem too large when compared with the size of the beds(or scale up the beds... but scaling up is usually bad)