Pronajímatel účtuje vysokou částku.

Because it is in the accusative singular feminine.

• částka is a feminine noun meaning amount/sum
• vysoká is the adjective high
• after the verb účtovat / účtuje, the thing being charged is the direct object
• in Czech, the direct object usually goes in the accusative case

So:

• vysoká částka = nominative: a high amount
• vysokou částku = accusative: a high amount as the object of the verb

This is why the sentence has:

• Pronajímatel = subject
• účtuje = verb
• vysokou částku = object

Pronajímatel is in the nominative singular, because it is the subject of the sentence.

It is a masculine animate noun. In this sentence, it means the person doing the action of charging.

Basic pattern:

• Pronajímatel = the landlord / lessor
• účtuje = charges
• vysokou částku = a high amount

So the nominative marks who is performing the action.

Usually, yes: pronajímatel is the person who rents something out to someone else, so landlord is often the best translation.

More literally:

• pronajímat = to rent out / lease out
• pronajímatel = the one who rents out

A useful contrast is:

• pronajímatel = landlord / lessor
• nájemce = tenant / lessee

So pronajímatel is specifically the party offering the property or item for rent.

účtuje is the 3rd person singular present tense form of účtovat.

That means it can translate as:

• charges
• is charging
• sometimes, depending on context, does charge

Conjugation of účtovat in the present:

• já účtuji / účtuju
• ty účtuješ
• on/ona/ono účtuje
• my účtujeme
• vy účtujete
• oni účtují / účtujou

In the sentence, pronajímatel is singular, so the verb is also singular: účtuje.

účtovat is usually imperfective.

That means it describes an ongoing, repeated, or general action, such as:

• The landlord charges a high amount
• The landlord is charging a high amount
• The landlord usually charges a high amount

If you wanted a more clearly completed idea in some contexts, Czech often uses a perfective partner, but for this everyday statement about what someone charges, účtovat is the normal choice.

Because Czech does not have articles like English a/an/the.

So Czech often expresses:

• a high amount
• the high amount
• sometimes just high amount

using the same noun phrase, with the exact meaning understood from context.

Here, vysokou částku does not explicitly say a or the. English needs an article, but Czech does not.

Yes. Czech word order is much more flexible than English word order because the case endings show grammatical roles.

The neutral order here is:

• Pronajímatel účtuje vysokou částku.

But other orders are possible, for example:

• Vysokou částku účtuje pronajímatel.
• Pronajímatel vysokou částku účtuje.

These alternatives can sound more marked and may shift the emphasis or focus.

For a learner, the given order is the safest and most neutral: subject + verb + object.

Yes, it is natural. Czech often uses vysoký / vysoká / vysoké with amounts, prices, salaries, fees, and numbers in a way similar to English high.

So:

• vysoká cena = high price
• vysoký plat = high salary
• vysoká částka = high amount / large sum

In English, you might sometimes prefer a large amount or a large sum, but in Czech vysoká částka is perfectly normal.

A rough English-friendly guide is:

• Pronajímatel ≈ pro-na-YEE-ma-tel
• účtuje ≈ OOCH-too-ye
• vysokou ≈ VI-so-koh
• částku ≈ CHAAST-koo

A few important pronunciation points:

• á is a long vowel
• í is a long vowel
• ú is a long vowel
• č sounds like ch in church
• j sounds like English y
• ou is a diphthong, roughly like oh with a glide

Stress in Czech is normally on the first syllable of each word:

• PROnajímatel
• ÚČtuje
• VYsokou
• ČÁSTku

Částka is a very common word for amount or sum, especially in practical or financial contexts.

You may also see:

• suma = sum
• obnos = amount, sum
• poplatek = fee
• cena = price

But částka is especially natural when talking about a monetary amount being charged.

So účtuje vysokou částku sounds normal and idiomatic.

Yes, depending on context.

The verb účtovat can mean things like:

• to charge
• to bill
• to invoice

So the sentence can suggest that the landlord is demanding a lot of money.

In natural English, depending on context, you might render it as:

• The landlord charges a high amount.
• The landlord is charging a lot.
• The landlord is asking a high price.

The exact English wording depends on what kind of payment is being discussed.

The dictionary forms are:

• pronajímatel — noun, masculine animate, landlord / lessor
• účtovat — verb, to charge / bill
• vysoký — adjective, high
• částka — noun, feminine, amount / sum

In the sentence, they appear as:

• Pronajímatel — nominative singular
• účtuje — 3rd person singular present
• vysokou — accusative singular feminine
• částku — accusative singular feminine

That would be:

Pronajímatelé účtují vysoké částky.

What changed:

• Pronajímatel → Pronajímatelé
  nominative plural
• účtuje → účtují
  3rd person plural
• vysokou částku → vysoké částky
  accusative plural feminine

So this sentence is a good example of agreement and case working together in Czech.