The Shuttle Bus at Hotel Nagoya Castle
The Westin Nagoya Castle's shuttle bus is recommended by expert reviewers. Out of 3 reviews tracked on TripExpert, 3 referenced the shuttle bus, like Frommer's, Fodor's and Lonely Planet.
Hotel Nagoya Castle 
Frommer's
Fodor's
Lonely Planet
Frommer's "Otherwise, the location is rather inconvenient, though courtesy shuttle buses to Nagoya Station once an hour are a big plus, and joggers might like the proximity of the castle grounds and an adjacent park; ask the concierge for its map of a 3"
Fodor's "A free shuttle bus connects you with JR Nagoya Highway Bus Station from 8:30 to 8"
Lonely Planet "There's a shuttle bus to/from Nagoya Station"
