Two questions on article

Hi.

1. I think I have asked a similar question as part of a thread but since I could not find it, I have decided to start a new thread. Let us try to adjectives like "vibrant" in front of the names of countries, cities and streets. Let also pretend vibrant the "XXX" below represents any of those names of countries, cities, or streets. For this I think we can either put the definite article "the" or indefinite article "a" depending on whether weant to be specific about it or make the name of one of the three of a type of it. (Even after having written it, I don't know what I am saying. Can you help?)

vibrant XXX or a vibrant XXX

If I change the adjective to the word "peaceful," then I think what you usually have situation where no article is needed.

eg,

peaceful XXX

2. Can we put the word "no" in front of what I think is a gerund phrase (or is it a gerund clause?)?

No playing soccer in the room.