Running until the end of July, the campaign targets travellers in Germany, Austria, Poland, Czechia and Hungary aiming to raise awareness of the "Local Host/Your Host" label and encourage bookings at certified family accommodations.
HTZ has awarded the "Local Host" label since last year to hosts in family and household tourism accommodation.
According to updated figures, 3,400 hosts have joined the programme, mainly in Istria, Kvarner and Split-Dalmatia County.
HTZ director Kristjan Staničić said the initiative responds to growing demand for authentic experiences and personal contact, highlighting hosts who help preserve local identity, culture, tradition and the environment.
Alongside Booking.com activities, HTZ promoted the label through online channels, including Facebook, Instagram and YouTube.
These activities generated more than 69 million impressions, while the campaign video had nearly 14 million views.