The Restaurant at Hotel Diamar
The restaurant at Hotel Diamar is praised by professional reviewers. Out of 2 publications that we tracked, 2 acknowledged the restaurant, including Lonely Planet and Oyster.
Hotel Diamar 
Lonely Planet
Oyster
Lonely Planet "There is wi-fi, a cafeteria and a good restaurant (mains €12)"
Oyster "Features here include a full-service restaurant with a hot breakfast buffet for a fee, a cafe and evening cocktail bar, and game room with billiards"
