We've had a wonderful time in Santorini and a great experience staying in Louis Studios. We didn't get to meet Dimitris but his father, Louis instead who picked us up at the ferry port on our arrival and sent us back there on our departure which is really nice. The apartment is clean and comes with a small kitchen area which you can cook up a meal. There is a minimart five minutes away which belongs to Louis that opens from 8am to 10pm and you can buy your daily needs like bread, drinks, fruits...etc so that's really convenient. You can walk further down from the minimart to the beach area which features the unique black sand from the volcanic region. The studio is located next to the airport so expect noise from planes taking off but that didn't bother us at all.
There is a swimming pool which is very inviting except the water was icy cold even on a scorching hot day and this was in early October period. Daily room cleaning is included which is great.
One thing to note is that Louis Studios is located at Kamari which is about 20km away from Oia (furthest point of the tourist spot on the island) and there aren't any bus services from within walking distance. Louis can arrange for rental of car, scooter or ATV (all terrain vehicle) which is the best way to travel around Santorini and it is not that difficult to ride around as long as you have GPS. You can pretty much park anywhere around the island especially for scooters and ATVs as long as it does not obstruct traffic flow.
Louis is a very hospitable and lovely person to chat with. And so are the people working there. Overall a great experience staying at Louis Studios at the price offered. Just take note of the need to rent a transport to travel around and you'll have the same great experience as we had.