Margalef - great climbs through the grades and likely good weather
Positano - amazing situation - there's a reason it's so expensive there in the summer - and great weather all year round... I got roasted climbing there on new years eve one year.
Finale Ligure - although I was there last easter and it rained for half the week, so we were limited to one overhanging crag for a lot of it, the climbing was amazing and the woman in the campsite was quite distressed when I was leaving that I'd had such bad weather, she'd never known anything like it. Leave your ego at home though, it's proper old school grading and bolting.