My girlfriend and I really enjoyed our stay at Strawberry Villa. Staying in Emporio is preferable to staying in somewhere like Oia or Fira as it's far less touristy and is very close to Perissa beach.
The apartment itself is superb. It is small but perfectly formed. The rooftop area with the hot tub is great and we spent most of our evenings up there.
Yiannis is a brilliant host and was so helpful, he gave us lots of good advice and helped us arrange most of our excursions.
If you want to visit Santorini, this is a great place to stay