Za jedno noćenje u tom apartmanu cijena nije loša, pa ćemo možda ondje prenoćiti i sljedeći vikend.

Because noćenje means an overnight stay or one night’s accommodation, which is especially common in hotel/apartment contexts.

• za jedno noćenje = for one overnight stay
• za jednu noć = for one night

Both can be understandable, but noćenje sounds more natural when talking about accommodation prices.

Also note the grammar:

• za takes the accusative
• noćenje is a neuter noun, so you get jedno noćenje

It is in the locative case because u here means in and shows location, not movement.

• u tom apartmanu = in that apartment

Breakdown:

• u
  • locative = location
• tom = locative singular of taj (that)
• apartmanu = locative singular of apartman

Compare:

• u tom apartmanu = in that apartment
• u taj apartman = into that apartment

So if there is no movement, Croatian uses u + locative.

Because cijena is a feminine singular noun, and the adjective must agree with it.

• cijena = feminine singular
• loša = feminine singular form of loš (bad)

So:

• cijena nije loša = the price isn’t bad

If the noun were neuter or masculine, the adjective form would change accordingly.

It usually means not bad, but in context it often implies pretty decent, quite reasonable, or fairly good.

So in this sentence, cijena nije loša suggests:

• the price is acceptable
• the speaker thinks it is reasonably good
• it is good enough to make staying there again a real possibility

This works very much like English not bad.

Croatian word order is more flexible than English word order. The sentence starts with Za jedno noćenje u tom apartmanu to set the context first:

• As for one overnight stay in that apartment...
• For one night in that apartment...

Then the main point comes:

• cijena nije loša = the price isn’t bad

A more neutral English order might be:

• The price for one overnight stay in that apartment isn’t bad

In Croatian, fronting that phrase is completely natural.

Here pa means something like so, and so, or therefore.

It links the two ideas:

1. the price is reasonable
2. because of that, they may stay there again

So:

• cijena nije loša, pa ćemo...
  = the price isn’t bad, so we will / so we might...

In everyday Croatian, pa is very common and often sounds more natural than a more formal connector.

Because ćemo is a clitic form, and Croatian clitics usually appear very early in the clause, typically in the second position area.

So:

• pa ćemo možda ondje prenoćiti is the normal order

Breakdown:

• ćemo = future auxiliary
• prenoćiti = infinitive
• together: ćemo prenoćiti = we will spend the night / stay overnight

You may sometimes hear other word orders in speech, but pa ćemo možda... is the standard, natural choice here.

They are related, but one is a noun and the other is a verb.

• noćenje = an overnight stay / overnight accommodation
• prenoćiti = to spend the night, to stay overnight

So in the sentence:

• za jedno noćenje talks about the price of the stay
• ondje prenoćiti talks about the action of staying there overnight

Also, prenoćiti is a perfective verb, so it refers to one completed overnight stay.

Ondje and tamo both mean there.

The difference is mostly one of style and nuance:

• tamo = more everyday, very common in speech
• ondje = a bit more neutral, written, or slightly more precise

In this sentence, ondje refers back to the already mentioned place, that apartment.

So:

• možda ondje prenoćiti = maybe spend the night there

You could often replace ondje with tamo in conversation.

Here i means also, too, or as well, not simply and.

So:

• i sljedeći vikend = next weekend too / also next weekend

That means the speaker is considering staying there overnight again next weekend as well.

This little i is very common in Croatian and often adds the idea of also even when English would not use and in the same way.

Because Croatian often uses the accusative of time with no preposition for time expressions like this.

So:

• sljedeći vikend = next weekend
• cijeli dan = all day
• svaki tjedan = every week

Here sljedeći vikend functions as a time expression meaning when the action may happen.

Since vikend is masculine inanimate, its accusative form looks the same as the nominative:

• sljedeći vikend

So the lack of a preposition is completely normal.