Not all grammarians agree about the exact order of adjectives. I have seen a few different versions of the order (sequence) of adjectives that describe different qualities. If you use the following, generally-accepted convention I think you will be able to successfully place multiple adjectives in a sentence: http://www.professorgrammar.com/ Click on "Grammar Rules and Exercises" Try the exercise.

Why do they need to go in a certain order? The three adjectives could have been in any order.

Mr. Lopez: Maybe the writer wanted to emphasize that he was referring to a dirty room. Police officer: What kind of room was it? Man: It was a DIRTY ROOM. Police officer: Was it large or small? Man: Small. Police officer: Was it dark or well-lit? Man: Dark. Police officer: Oh, I see now. It was a small, dark DIRTY ROOM. Man: Exactly!

In your example, I think the adjectives can go in any order. These adjectives seem to be personal opinion and basically sit on the same level. There's something else: a "dark room" can be a room where photographs are developed. So it makes sense to keep these words apart to avoid confusion. I don't think this is a very good example to illustrate adjective order.