I was supposed to meet my sister in San Francisco one year but the hotel I had booked was horrendous so I had to find a place to stay for a few nights before she arrived. The White Swan Inn saved my bacon. My room had a little fireplace in it and was the definition of cosy, which is weird considering it is quite near Union Square. So the bed part was great. Breakfast was served in a lush little parlour and was really good - scrambled eggs, bagels, muffins - I felt really fat! I felt really at home and was happy killing time with a book in the parlour. I haven't stayed in many places in San Francisco so I don't know if this kind of character in a place is normal but I had a super stay and would be happy recommending it - although if you expect it to be like and English B&B in price (i.e. £25 a head) you'll be disappointed. Even with a strong exchange rate it wasn't cheap.
Bush Street in the Nob Hill area
Is this your business?