This is the 154th most frequent Slovenian word.
naše
"Our" (possessive pronoun).
In this sentence, 'naše' is a possessive pronoun in the neuter singular form, indicating that the apartment belongs to the speaker and others.
To je naše stanovanje.
This is our apartment.
Here, 'naše' refers to something that belongs to the speaker and others. 'Mesto' is neuter singular, so 'naše' agrees with it in gender and number.
Naše mesto je zelo lepo.
Our city is very beautiful.
In this context, 'naše' modifies 'delo', which is also a neuter singular noun, showing possessive agreement.