Absolutely stellar - I can't recommend Marguerite's place highly enough. Impeccably clean, stylish, lovely neighbourhood, great facilities and private bathroom, and just above-and-beyond friendliness and helpfulness from Marguerite.
The night I arrived (on my first ever trip to the US) she made me tea and we sat and talked about San Fran and all its various attractions for two whole hours. She even marked up a map for me! Marguerite is a very engaged and enthusiastic host, and loves to chat.
Daly City is a great, safe location, 10-15 minutes walk from a shopping centre and within easy Uber or Lyft reach of either San Fran or the BART to take you there. Perfect if you can't spend $200+ a night to stay in SF itself!
I can't wait to come back to SF and would love to stay here again - if I could give it more than 5 stars, I would.