इस फ्लैट के लिए तुम्हें कितना किराया देना है?

Because के लिए is a postposition, and Hindi uses the oblique form before postpositions.

• Direct form: यह फ्लैट = this flat
• Oblique form before a postposition: इस फ्लैट के लिए = for this flat

So यह changes to इस here.

फ्लैट is a very common Hindi loanword from English flat, meaning an apartment. In everyday modern Hindi, especially in cities, people often use फ्लैट, अपार्टमेंट, or native words depending on context.

So yes, it is completely normal.

के लिए means for.

In this sentence, इस फ्लैट के लिए means for this flat. It shows what the rent payment is connected to.

It is a very common postposition in Hindi:

• मेरे लिए = for me
• तुम्हारे लिए = for you
• इस काम के लिए = for this work

Because के लिए is a fixed expression meaning for. It is not the same thing as possessive का / की / के by itself.

Compare:

• इस फ्लैट का किराया = the rent of this flat
• इस फ्लैट के लिए = for this flat

So in your sentence, the idea is not simple possession; it is for this flat.

Because Hindi often uses the dative-style form with expressions of obligation.

तुम्हें ... देना है literally works like:

• to you ... is to give

In natural English, that becomes:

• you have to pay ...

So तुम्हें marks the person who is required to do the action.

This pattern is very common:

• मुझे जाना है = I have to go
• उसे पढ़ना है = he/she has to study
• तुम्हें देना है = you have to give/pay

Yes, basically.

• तुम्हें
• तुमको

Both can mean to you or you in this kind of structure. तुम्हें is often a bit more common in everyday speech, but both are correct.

So this sentence could also be: इस फ्लैट के लिए तुमको कितना किराया देना है?

Because कितना means how much here, and it agrees with किराया.

Since किराया is a masculine singular noun, Hindi uses:

• कितना for masculine singular

Examples:

• कितना पानी = how much water
• कितना समय = how much time
• कितना किराया = how much rent

Yes, किराया is masculine singular.

That is why the sentence uses कितना, not कितनी.

A useful clue is that many nouns ending in -आ / -या are masculine, and किराया behaves that way grammatically.

So:

• किराया कितना है?
• not किराया कितनी है

Yes, देना literally means to give, but Hindi often uses it in places where English uses pay.

So किराया देना is a normal way to say to pay rent.

Similar patterns:

• पैसे देना = to pay money
• फीस देना = to pay fees
• किराया देना = to pay rent

This is very natural Hindi.

Here देना है expresses obligation or what is due.

So तुम्हें कितना किराया देना है means something like:

• how much rent you have to pay
• how much rent you need to pay
• how much rent you are supposed to pay

It does not simply mean a plain present tense you give.

By itself, किराया just means rent. The time period is not stated explicitly.

In real life, people often understand it from context:

• monthly rent
• yearly rent
• deposit-related discussion, depending on the situation

If you want to be specific, Hindi can say:

• मासिक किराया = monthly rent
• हर महीने कितना किराया = how much rent every month

Yes, Hindi word order is somewhat flexible, though some orders sound more natural than others.

The given sentence is natural: इस फ्लैट के लिए तुम्हें कितना किराया देना है?

You could also hear: तुम्हें इस फ्लैट के लिए कितना किराया देना है?

What usually stays together is कितना किराया, because कितना modifies किराया.

Replace तुम्हें with आपको.

So the formal version is: इस फ्लैट के लिए आपको कितना किराया देना है?

That is more polite and appropriate for strangers, elders, or formal situations.

Yes, and that is a very useful comparison.

• इस फ्लैट का किराया कितना है? = What is the rent of this flat?
• इस फ्लैट के लिए तुम्हें कितना किराया देना है? = How much rent do you have to pay for this flat?

The first asks about the rent amount more generally. The second focuses on what you are required to pay.

So they are close, but not exactly the same in emphasis.

तुम्हें is informal to neutral, depending on region and relationship.

It is commonly used:

• with friends
• with younger people
• with people you know well

It is less formal than आपको and more neutral than very intimate तुझे.

So this sentence sounds natural in casual conversation, but not especially formal.