I spent a week at Rosemary Villa with 2 teenage daughters and it was perfect for us. It's a traditional cycladic house, recently renovated with a beautiful design and finish. There was plenty of room for 3, with comfortable beds, beautiful bathrooms, a small kitchen, all cleaned daily. But the highlight was the private rooftop terrace with views over the village and out to sea. We used the hot tub every evening and did lots of star-gazing as Emporio has great dark skies & little light pollution.
The villa is situated at the top of the old village - up lots of little alleys which felt very authentic, safe and unspoilt by tourism.
The village has everything you need - supermarkets, cafés and restaurants, an ATM, pharmacy & bakery. The bus stop and supermarkets are just 5 minutes' walk downhill, with cafés just a few seconds away.
Emporio is situated in the middle of the island but it's very easy to travel out to the villages on the caldera (for sunset views) to the west and to beautiful beaches to the east and south. We got around by bus very easily, travelling to Fira, Oía, Perissa, Perivolos, Megalachori and Akrotiri - it took a bit of planning but was easy using a timetable which Yiannis sent me. Yiannis organised taxis if we needed them, including airport transfers. We took a water taxi to red and white beaches from Akrotiri, which were particularly beautiful. We spent a lot of time at the black beach at Perissa (10-15 mins by bus) - hot black sand and lovely clear water for swimming and snorkelling.
Yiannis checked in with us regularly and made us feel very welcome. I would recommend Rosemary Villa without hesitation for a holiday away from Santorini's crowded touristy areas such as Oía and Fira - we loved visiting them but were more than happy to get back to Emporio at the end of the day.