eki ni tikaino ha benri desu ga, yoru no souon ga sukosi ki ni narimasu

Here, の turns the whole phrase 駅に近い (to be close to the station) into a noun-like idea.

• 駅に近い = is close to the station
• 駅に近いの = being close to the station / the fact that it is close to the station

So:

• 駅に近いのは便利です = Being close to the station is convenient

This の is called a nominalizer. It lets a clause act like a noun.

With 近い (close), Japanese often marks the thing you are close to with に.

• 駅に近い = close to the station
• 海に近い = close to the sea
• 学校に近い = close to the school

So に here shows the reference point: the station is the thing something is close to.

The は marks 駅に近いの as the topic: as for being close to the station...

That makes the sentence feel like it is presenting one aspect, then giving a comment about it:

• 駅に近いのは便利です = As for being close to the station, it’s convenient

Using は also fits well because the sentence later contrasts that good point with a bad point:

• convenient, but...
• です が...

So は helps set up a topic for discussion, while が would sound more like identifying or emphasizing the subject.

便利 is a na-adjective (or adjectival noun).

That means:

• plain form: 便利だ
• polite form: 便利です
• before a noun: 便利な場所 = a convenient place

So in this sentence:

• 駅に近いのは便利です = being close to the station is convenient

Even though it translates like an English adjective, grammatically it behaves a little differently from i-adjectives like 近い.

Here が means but.

• 便利です = it is convenient
• 便利ですが = it is convenient, but...

This is a common written or polite spoken way to connect two ideas. It often sounds a bit softer than starting a new sentence with でも.

So the sentence structure is:

• positive point: 駅に近いのは便利です
• contrast: が
• negative point: 夜の騒音が少し気になります

夜の騒音 means nighttime noise or noise at night.

Breakdown:

• 夜 = night
• の = links nouns, like of or an attributive marker
• 騒音 = noise / loud noise / noise pollution

So:

• 夜の騒音 = the noise of the night / nighttime noise

In natural English, nighttime noise is the best translation.

The verb-like expression 気になる often takes the thing that bothers you or catches your attention with が.

So:

• 騒音が気になる = the noise bothers me / I’m concerned about the noise
• 音が気になる = the sound bothers me
• においが気になる = the smell bothers me

Here が marks the thing that is causing concern: 夜の騒音.

Literally, 気になる is something like to become a matter of concern to one’s mind. In natural English, it often means:

• to bother someone
• to worry someone
• to catch someone’s attention
• to be concerned about something

In this sentence:

• 夜の騒音が少し気になります = The nighttime noise bothers me a little / I’m a little concerned about the nighttime noise

It is a very common and natural Japanese expression, and it is often softer than a direct negative statement.

For example:

• ちょっと気になります = it bothers me a bit
• その点が気になります = that point concerns me

少し means a little.

It softens the complaint:

• 夜の騒音が気になります = the nighttime noise bothers me
• 夜の騒音が少し気になります = the nighttime noise bothers me a little

This is very natural in Japanese, especially when giving criticism politely. It can make the statement sound less harsh and more tactful.

The sentence uses polite forms:

• 便利です
• 気になります

This makes it suitable for normal conversation, especially when speaking to someone you do not know well, or in a formal setting like discussing an apartment, hotel, or neighborhood.

The plain form would be:

• 駅に近いのは便利だが、夜の騒音が少し気になる。

That sounds less polite and more like written style or casual speech.

Yes, but the structure would change.

You could say:

• 駅の近くは便利です
• 駅の近くは便利ですが、夜の騒音が少し気になります

But this means the area near the station is convenient, while 駅に近いのは便利です means being close to the station is convenient.

So the original sentence focuses on the condition or feature of being close to the station, not just the location itself.

The sentence leaves that unstated. Japanese often omits things that are understood from context.

So depending on the situation, it could mean:

• an apartment near the station is convenient, but noisy at night
• a hotel near the station is convenient, but noisy at night
• living near the station is convenient, but noisy at night

The grammar does not explicitly name the thing; it just comments on one feature (being close to the station) and one drawback (nighttime noise).