Nikolas is amazing host; he helped us right from pickup from airport until airport drop.
You will feel special with Nikolas and his beautiful -heart of Oia - home. Evrthing is walkable except Fira. You can go Fira by public transit which is near to the place - Oia Square.
All the popular selfie spots are nearby including sunset point.
If you want to make a best pf the trip, I would recommend this place.