Looking for restaurant recommendations suitable for a solo traveler. I'll be staying in the Nob Hill / Union Square area for 4 days, but am open to exploring any area of the city. Interested in places where I won't feel uncomfortable by myself. For breakfast, looking for casual places where I might be able to linger over coffee and a paper. For lunch, looking for a place with either good atmosphere, nice view, people watching, or something unique to San Francisco (this is my first visit). For dinner, looking for more upscale places with bar seating and a good wine selection by the glass.
Thanks for your help!