There are many types of walls with windows and doors to make nearly any room you want. There are wooden doors, with brass, and windows with blinds and even arched top doors and windows with walls.Each wall section has 3 layers so you can build a room with textures and a sub wall so you can make or used what I made to texture the paper and hide areas of the paper to make it look like it is peeling and it exposes the sub-wall under the paper.The arched top windows are an old style with cloth blinds, while the normal windows has venetian blinds that can be raised, closed down, and closed up, so they function the way you would think they should. The windows open, and I am sure they should. These slide up, and I have been using these for a very long time. There is a smaller window and wall for that to use in laundry rooms, bathrooms, and over the kitchen sink. This was made for interior rooms, but there is an outside to the walls, just in case you want to render a view looking through the windows of the inside scene.
The floor is two sided so there is a ceiling under the floor, so it serves two purposes, and work better with more than one story. Twisted Staircase sold separately, and includes the same type of walls.