We had a excellent stay in Sifnos at Dina’s airbnb with great communication before a d during our stay. She provided us good tips and a sample itinerary for our time on the island, which were great, plus some beach towels to borrow! The apartment was right by the harbor (= very convenient for ferry arrival and departure) and had everything we needed to have coffee and a simple breakfast in the morning. And the airco worked great.