Here's a concise and friendly self-introduction for your Flatmates profile based on your strengths:
"I'm a clean and considerate roommate who values a peaceful living environment. As someone new to the area, I don't host parties and prefer quiet evenings at home. You can count on me to maintain shared spaces and respect house rules."
This highlights your cleanliness and quiet nature while keeping it positive and inviting. You can adjust the wording slightly if you'd like to emphasize other aspects.