Kaleidos is a really cool place, full of hip and stylish modern art and the best huge terrace you've ever seen - with two wonderful cats to keep you company. It can be a bit noisy because of the location [there are always people around on Marqueda Street, usually gets quieter after 1-2am] but it also depends on which side of the building your room is. Viola is the sweetest and most helpful host in the world. And you can't get more central than this in Palermo ;)