dōngtiān zài ānjìng de fángjiān lǐ hē rè chá, tīng yīnyuè, ràng rén juéde hěn wēnnuǎn.

The “subject” of 让 here is not a single word, but the whole situation described before the comma:

冬天在安静的房间里喝热茶、听音乐
(drinking hot tea and listening to music in a quiet room in winter)

So you can mentally read the sentence as:

冬天在安静的房间里喝热茶、听音乐 这件事 让人觉得很温暖。
This activity (doing X) makes people feel warm.

Chinese often does this: [clause / situation] + 让 + 人 / 我 / 大家 + 觉得… where the first clause is what causes the feeling.

Time words in Chinese normally don’t need a preposition:

• 冬天在安静的房间里… = In winter, in a quiet room…
• 昨天我去北京。 = Yesterday I went to Beijing.

You can say 在冬天, but for general “in winter / in summer / on Monday” etc., native speakers usually just put the time word directly in front of the rest of the sentence. A more explicit and common alternative is:

• 冬天的时候，在安静的房间里喝热茶、听音乐…

Yes. A very common pattern is:

[Time] + [Place] + [Verb …]

So here:

• 冬天 (time)
• 在安静的房间里 (place)
• 喝热茶、听音乐 (actions)

Reordering it to something like 在安静的房间里冬天喝热茶… sounds unnatural. Put the time expression before the place expression in most cases.

在 marks location (“at / in / on”), and 里 means “inside”. Together:

• 在房间里 = in(side) the room

Variations:

• 在安静的房间里喝热茶 – very natural and clear.
• 在安静的房间喝热茶 – also OK; 里 is optional here.
• 安静的房间里喝热茶 – you can drop 在 in many everyday sentences; the location phrase right before the verb still works.

So the given form 在安静的房间里 is a very typical, slightly fuller way to say “in a quiet room (inside it)”.

的 links modifiers to nouns. Here 安静 (quiet) is describing 房间 (room), so we use:

• 安静的房间 = “quiet room”

General pattern:

[adjective / phrase] + 的 + noun

Examples:

• 漂亮的老师 – pretty teacher
• 中国的音乐 – Chinese music

Sometimes 的 is dropped with very close adjective–noun pairs (like 大学老师, 老朋友), but with a normal descriptive adjective like 安静, you keep 的.

Chinese often links actions with a comma instead of using 和:

• 喝热茶、听音乐 = “drink hot tea, listen to music”

You can say:

• 喝热茶和听音乐 – this is grammatically fine, but it slightly emphasizes listing two separate activities.

With a comma, it feels more like a smooth sequence / combination of actions. When linking nouns rather than verbs, 和 is more common, e.g. 茶和咖啡 (tea and coffee).

Breakdown:

• 让 – to let / make / cause
• 人 – people (generic “one / people”)
• 觉得 – to feel / to think (subjective feeling)
• 很温暖 – (feel) warm

So 让人觉得很温暖 literally = “makes people feel very warm.”

Common pattern:

让 + [person] + 觉得 / 感到 + [adj / phrase]

Examples:

• 这首歌让他觉得很放松。 – This song makes him feel very relaxed.
• 你的话让我很感动。 – What you said really moves me.

Both can be used, but the nuance is different:

• 让人觉得很温暖
  – Focuses on the subjective feeling (“makes people feel warm”).
  – Very common when talking about emotional or inner feelings.

• 让人很温暖
  – Grammatically OK, but sounds slightly less natural here.
  – More often used when “warm” is treated like a direct resulting state.

Using 觉得 (or 感到) makes it clearly about someone’s perception / emotion, which fits this sentence well.

In this kind of sentence, 人 is generic:

• 让人觉得很温暖 ≈ “it makes people feel warm” / “it makes one feel warm”.

If you want to say “me” specifically, you can replace it:

• 让我觉得很温暖。 – It makes me feel warm.
• 让大家觉得很温暖。 – It makes everyone feel warm.

So here 人 = “people in general; one; anyone”.

In modern spoken Chinese, 很 before an adjective in this kind of sentence often behaves like a neutral linker, not a strong “very”:

• 觉得很温暖 ≈ “feels warm” (not necessarily “very very warm”).

If you say 觉得温暖 without 很, it is grammatically OK but can sound a bit bare or like a contrast (“not cold but warm”), or more written/formal.

So 很 is often added to make the adjective sound natural and smooth in a predicate:
很高, 很累, 很安静, 很温暖, etc.

• 热 – hot (often physically; temperature is high)

  • 今天很热。 – It’s hot today.

• 暖和 – warm (mainly physical warmth; quite colloquial)

  • 房间里很暖和。 – It’s warm in the room.

• 温暖 – warm, but often with a soft / cozy / emotional feel. It can be physical or emotional:

  • 阳光很温暖。 – The sunlight is warm (and pleasant).
  • 你的话让我觉得很温暖。 – Your words make me feel warm inside.

In this sentence, 温暖 suggests both physical coziness and emotional comfort.

You add a measure word when you want to specify how much:

• 喝一杯热茶 – drink a cup of hot tea
• 喝一口茶 – take a sip of tea

But when you talk about the activity in general, without focusing on amount, you can just say:

• 喝茶 – drink tea
• 喝热茶 – drink hot tea

In this sentence, the focus is on the kind of activity, not on the quantity, so no measure word is needed.

Chinese often marks simultaneous actions with 一边…一边… or with 着:

• 冬天在安静的房间里一边喝热茶，一边听音乐，让人觉得很温暖。
  – In winter, drinking hot tea while listening to music in a quiet room makes people feel warm.

• 冬天在安静的房间里喝着热茶，听着音乐，让人觉得很温暖。
  – In winter, (while) drinking hot tea and listening to music in a quiet room…

In the original sentence, even without 一边, native speakers naturally understand the two actions as happening together.