My company has a membership with Club Quarters and I was put up here in San Francisco. I was pleased with the amenities and customer service. The rooms are small but not really that much of a concern as I travel alone. The Wi-Fi signal is great and free. Tthe location is perfect for my needs, located in the financial district. They have free bottled water and free snacks in the lobby.
The pub attached is casual and moderately priced. They also have other restaurants that you can have orders delivered to your room.
It's close to the Ferry Building at Pier One where there is a great farmers market and some incredible burgers at "G''s.