Kahvila on kadun kulmalla, joten löydän sen helposti.

Because kadun is the genitive singular form of katu.

In this phrase, Finnish expresses the corner of the street as kadun kulma — literally the street’s corner. So:

• katu = street
• kadun = of the street

Then that whole idea is put into a location form: kadun kulmalla = at/on the corner of the street.

Kulmalla is the adessive case, marked by -lla / -llä.

The adessive often means:

• on
• at
• sometimes by

So:

• kulma = corner
• kulmalla = on/at the corner

In Finnish, kadun kulmalla is the normal way to say on the corner of the street.

Finnish does not have articles like English a/an and the.

So kahvila can mean:

• a café
• the café

The exact meaning depends on context. In this sentence, the listener already knows which café is meant, so in English it would often be translated with the.

On is the third-person singular form of olla, which means to be.

So:

• minä olen = I am
• sinä olet = you are
• hän/se on = he/she/it is

Since kahvila is singular, the sentence uses on:

• Kahvila on kadun kulmalla = The café is on the corner of the street

Joten means so, therefore, or as a result. It introduces a result.

So the structure is:

• The café is on the corner of the street, so I find it easily.

By contrast, koska means because and introduces a reason.

Compare:

• Kahvila on kadun kulmalla, joten löydän sen helposti.
  = The café is on the corner of the street, so I find it easily.

• Löydän sen helposti, koska kahvila on kadun kulmalla.
  = I find it easily because the café is on the corner of the street.

In Finnish, the subject is often built into the verb ending.

Löydän comes from löytää = to find. The ending -n shows that the subject is minä = I.

So:

• löydän = I find
• minä löydän = I find

The pronoun minä is usually omitted unless you want emphasis or clarity.

Because sen is the form used here for the object.

• se = it (subject form)
• sen = it (object form, in this kind of sentence)

So:

• Se on kahvila. = It is a café.
• Löydän sen. = I find it.

In this sentence, sen refers back to kahvila.

Because helposti is an adverb, formed from the adjective helppo = easy.

A very common way to make adverbs in Finnish is to add -sti:

• helppo = easy
• helposti = easily

This is similar to how English often adds -ly:

• easy → easily

So löydän sen helposti means I find it easily.

Yes. Finnish often uses the present tense for both present and future meaning when the context is clear.

So löydän literally means I find, but depending on context it can also mean:

• I can find it
• I will find it

In this sentence, the idea is that the café’s location makes finding it easy, so English might translate it in a slightly more natural way depending on context.

Not completely. Finnish word order is fairly flexible, and changing it changes the focus or emphasis.

For example:

• Kahvila on kadun kulmalla.
  Focuses on the café as the topic.

• Kadun kulmalla on kahvila.
  Focuses more on the location: On the corner of the street, there is a café.

Both are grammatical, but they do not feel exactly the same. The original sentence is natural if the café is already the main topic.

Because joten joins two clauses, and in Finnish that is normally separated by a comma.

Here the two clauses are:

• Kahvila on kadun kulmalla
• joten löydän sen helposti

So the comma helps show the structure: fact/result → The café is on the corner of the street, so I find it easily.