The Zico is a nice change from a standard chain hotel. The spanish-style building has been given a huge facelift, and the decorating has been done with class and a sense of fun. The room I stayed in was of average size. The linens and furniture were well-chosen and appealing. The bed was very comfortable. The bathroom was a little cramped but very functional. The free breakfast was good, about on par with a standard business hotel, and much superior to a low-budget chain hotel breakfast.
I was only there two nights and did not need to interact with the staff very much, so I can't speak to the service, but my overall impression of the Zico is positive. Factoring in the price, the location, the food and the style of the hotel it is a good deal. I will definitely stay here again next time I am in the Bay Area on business.