Martha's place was everything I wanted. Clean, economical, and in a great spot to go out and experience the city. I would definitely tell people who are traveling to San Francisco solo to consider this place.
Martha was quick to answer text messages, and had a clean and comfortable space to stay in. For a private small duplex, the shower and bathroom was top-notch, and the bedroom was very comfortable. The heating system worked well and I slept well every night.
For those staying here: keep in mind that there is almost no flat ground in San Francisco! Martha's place is uphill from a number of great cafes and restaurants, and about a block from the bus and trains. But you will walk uphill to get back to the place, so be ready for that!
All in all I had a great time in the city and was lucky to have this as 'home base.'