I can not speak highly enough of The Secret Lounge.
It is, in my mind, in the best neighbourhood of San Francisco, really close to great restaurant and shops, and also to the Bart (metro) and buses that link to all point of interest.
The bed is very large and very comfortable. Really fast internet too.
We had the chance to meet David and Tina. They are both lovely and very helpful.
Do not look any further, this is the place !