Questions & Answers about Alueenne on hiljainen, ja sijaintinne on hyvä.
Why is there no separate word for 'your' before alueenne and sijaintinne?
In Finnish, the possessive suffix -nne already means 'your'. For the first and second person (my, our, your), you can drop the pronoun like teidän (your) completely, and just use the suffix on the noun. Saying teidän alueenne is also correct, but dropping teidän is very common.
Does the suffix -nne mean 'your' for one person or multiple people?
The suffix -nne is the plural or formal 'your' (matching the pronoun teidän). You use it when talking to a group of people, or when speaking politely to one person in a formal situation. If you were talking informally to one friend, you would use the suffix -si instead (alueesi, sijaintisi).
Do the base words alue and sijainti change when we add the -nne suffix?
In this sentence, they do not change. Because the nouns are in their basic dictionary form (the nominative case) as the subjects of the sentence, you simply attach the -nne suffix directly to the end of the word.
Why are the adjectives hiljainen and hyvä in the singular form if we are talking to multiple people?
The adjectives are describing the nouns alue (area) and sijainti (location), not the people you are speaking to. Since you are talking about one shared area and one shared location, those nouns are singular, so the adjectives must also stay in the singular form.