The Restaurant at Hotel Gablerbrau
Hotel Gablerbrau's restaurant is acknowledged by professional travelers. Out of 2 publications that we tracked, 2 mentioned the restaurant, such as Frommer's and Lonely Planet.
Hotel Gablerbrau 
Frommer's
Lonely Planet
Frommer's "Inside are three restaurants: one with vaulted ceilings and murals, another covered with wrought-iron detailing, and the third -- the least formal -- a beer hall"
Lonely Planet "The vaulted restaurant (mains €8 to €15) has a seasonal menu with vegetarian options"
