The Thinking Traveller
Specialising in luxury villas in the Mediterranean regions of Sicily and Puglia in Italy, The Ionian and Sporades islands in Greece and Corsica in France, The Thinking Traveller has villas exclusive to them (so you won't find them listed anywhere else online). If you're a little last minute, search by the tab "summer '19 availability" to avoid the heartache that is falling in love with somewhere that's already spoken for.