1. a person who stays at a hostel, especially a young traveler on a budget
Usage: common in travel and tourism contexts
2. a person who operates or manages a hostel
Usage: less common than the first sense

Examples

• Many hostelers prefer staying in dormitory rooms to save money while traveling.
• The hosteler at the front desk helped us book tours for the next day.
• Young hostelers from around the world gathered in the common area to share travel stories.
• As a budget-conscious hosteler, she visited three countries in two weeks.
• The experienced hosteler knew all the best local restaurants near the accommodation.