The cave home is a beautiful and well-maintained space (the daily housekeeping was quite nice especially with 3 of us sharing the place). We were happy with the location in Finikia, the closest village to Oia, because it was an easy walk to Oia but felt more authentic and less touristy. It takes about 10 minutes to walk from the Finikia village parking lot to the beginning of Oia, though it also takes about 7 minutes to get from the Finikia village parking lot to Margarita's house through the stairs and winding footpaths (but I enjoyed the path through Finikia and Margarita had an assistant to take our luggage to the parking lot for arrival/departure). Locals we met in Oia were immediately nicer once learning we were staying in Finikia. Margarita was very organized and easy to reach.
One tip to be aware of - Margarita kindly offered to arrange a taxi to pick us up from the port. This was a van pool of approximately 15 people in a very hot van on a scorching hot day. We learned during our stay that shared taxis and vans are common in Santorini, but the lack of air conditioner is not. There was a stressful delay leaving the port because the drivers said they had heard there were 2 of us joining, not 3 as on our airbnb reservation, and there wasn't enough room. Everything worked out ok -- just wanted to warn for anyone who might have difficulty with heat you might want to arrange your own ride. We found an air conditioned taxi to the airport by asking a hotel in Oia for a driver's number.