Right behind Cowboy Ciao is Kaz's Wine Bar, which shares a cellar with CC and is owned by the same people. You have to know where it is, as there is no sign (they don't want tourists who are just looking for a cold one dropping in, but instead they cater to serious wine drinkers). It remains to this day the most interesting wine bar I've visited, and that was 6 years ago (and a lot of wine bars since!) A wine list the size of a book, with plenty of interesting options. They do some food, too, but the focus is really the wine.