Great Stay
The Hotel Rex was an excellent place to stay in San Francisco. Their rooms were lovely, and they had a nice bar/lounge area which was quite comfortable. They also had a restaurant with creative and tasty items to choose from. Even better, it wasn't terribly expensive (compared to the other restaurants which were around.
There was a slight mix-up, as I tried to upgrade my room after reserving it, and the hotel was unwilling to take my credit card to guarantee the upgrade. When I showed up, I was told that I would not be given the upgrade. However, they did provide us with a reasonable alternative (a slightly larger room with a roll-away bed for free). Overall, it worked out fine, and was in a great location for the conference I attended.