Going to Madrid Feb. 25-Mar. 1 (Sunday - Wednesday), what are the "must eats" there? We would like to splurge on one nice meal, were considering Viridinia, and also wanted to try some excellent Paella. Any recs for tapas, and other authentic Spanish food is much appreciated. We're staying at the Westin Palace, but locale isn't really an issue, since we will travel for great food. Thanks!