This is THE perfect place for a romantic stay in Oia.
We spent 3 days here and it is absolutely amazing. The value was amazing, yes there are cheaper places but for what you get it is underpriced. This is the type of place you see on Instagram and think it will cost thousands per night.
Views - these are probably the best in Santorini, you can see Fira, the volcano and the rest of Oia, including the blue domes people line up to take pictures with. Most other parts of Santorini only give you one of those.
The best part was enjoying sunset from the private hotub. The sun sets behind Oia, not on the water but you can go and line up 2-3 hours ahead of time at the castle if you want that view. Honestly, stay in the hotub and watch the sun set over Fira and soak in the view. We walked past many other luxury apartments which had much more limited views.
In addition to the private hotub there was a deck with chairs for sunbathing as well.
The apartment is simply, but well, furnished. Kitchen not for cooking in but this is not a place you come to cook. The bed was comfortable and plenty of hot water in the shower. The interior is a 'cave' cut out of the cliff, extremely cool and unique. The interior stays cool due to this which is a great relief from the heat of Santorini.
We loved the table on the balcony for breakfast/afternoon wine.
Check-in was a breeze, the housekeeper met us and helped with bags (be sure to tip well). John was extremely responsive via the app and arranged transport from the ferry and to the airport at fair rates.
Only thing to note is that the apartment is down many stairs at the very edge of the cliff. This does mean from the balcony there are NO other buildings between you and the view. We had biiiiiiig bags as part of a long holiday so the stairs were a challenge, as noted we paid the housekeeper to help. If you have mobility issues then John's place will not be suitable.
If you are planning a romantic trip to Santorini book John's place.