Questions & Answers about Hótelið er fullt í kvöld.
The ending -ið is the definite article attached to the noun.
- hótel = a hotel (indefinite)
- hótelið = the hotel (definite)
In Icelandic, the definite article (the) is usually added as a suffix to the noun instead of being a separate word like in English.
Because hótel is a neuter noun, its definite nominative singular form is hótelið (the hotel as the subject of the sentence).