Hilton San Francisco Union Square
With 1,907 rooms and meeting space galore, this is the largest hotel in town. Business features are impressive, the restaurant is surprisingly nice, and the gym is well equipped. But rooms, which are undergoing renovations in waves through 2017, vary from impressive to so-so. Crowds of conventioneers and business travelers make it difficult to find peace and quiet (the lobby noise level is usually that of a dull roar), or to get help without waiting in a long line. Travelers in want of free Wi-Fi could check out the neighboring Grand Hyatt San Francisco, another business-friendly hotel in Union Square.