The apartment is exactly like the pictures - warm and cozy. Nicoletta was very prompt in her responses to my queries and we met Christina (her lovely daughter) who helped us check in extremely smoothly.
The apartment is near the Oia Post Office, literally a stone's throw from the Byzantine ruins and very convenient around Oia. The balcony had a lovely view of the sunrise/sunset/rest of Santorini.
The amenities were great and they provided a porter service (which really helps with the luggage over cobble stones). They are also able to arrange for transfer services to and from the airport. We were very glad to receive their personal recommendations as well.
Only 1 thing to note - the second floor/bathroom is quite low and we (asian women) had issues with bumping our heads!