Thessaloniki Hotels Association Porto Palace Hotel Thessaloniki Receives Green Key Sustainability Label 6 years ago Porto Palace Hotel Thessaloniki has received the eco-friendly “Green Key” international environmental label. Overnight Stays at Thessaloniki’s Hotels Decline First Half of 2019 7 years ago According to the Thessaloniki Hotels Association, overnight stays in hotels in have dropped by 16,486 in the first half of…