Instruct: Classify the given review into positive or negative sentiment.
Query: A great book by my favorite SF food critic.

I've come to trust and rely on Patricia Unterman's recommendations over the years. She is adept at evaluating the entire spectrum of the San Francisco dining scene, from top restaurants to bargain bites.Her fourth edition book is an excellent SF reference. As a Bay Area resident, I can vouch that her descriptions of the restaurants, markets, and other food shops is on target. There were even a few new finds in the book for me, like the lunch at the SF Art Institute Café.Not only is there nice background and detailed descriptions of SF restaurants, you will learn about food and drink in the area. I found the artisan sake write up informational. I find sections like the seasonal fish and produce charts very helpful. Both visitors and locals should find this guide useful.As always, Patricia Unterman captures the flavor of SF.