Chris & Tim are fantastic hosts. We felt genuinely welcomed at their place. Loving San Francisco themselves they made sure we'd have a great stay pointing out the best attractions and helping us with our plans.
Their home is clean, spacious and beautifully furnished. Big plus for the large drawer in the guest room. The location is, obviously, not exactly downtown, though public transport is very good with stops just around the corner.
I'd recommend staying with Chris & Tim 100 %.