I stayed at the Sheraton Petaluma twice recently on a Thursday night and Saturday night. The hotel had a wine country rate at $139 with a decent bottle of wine and cheese plate. The Club Lounge is closed Friday and Saturday nights, but open for breakfast everday. The food in the evening is decent. The beverage selection is very good, including free wines and good beers. Continental breakfast is OK, with very good 'homemade' granola and organic yogurt.
Platinum recognition is very good. Staff is friendly and efficient. I had a corner suite with balcony the first night and a corner suite with Jacuzzi the second night.
Petaluma is ~30 minutes from wineries, which is a reasonable price to pay for staying at a *Wood hotel, especially with the Q1 double stay/night credit promotion.