Villa Agas has to be one of the most comfortable place to stay in Santorini. It is spacious and very affordable as compared to all the other places you can rent in Santorini. Getting to the accomodation is a direct bus from the airport to Karterados , but if you arrive late at night, you will have to take a taxi there and taxis will easily cost you up to 20 euros.
The place is always clean as they have someone to clean your room daily, the swimming pool is amazing and the location is very central. Fira is a 10 minute walk and we even hiked to Oia (which took about 4 hours) but the view was fantastic.
The owners of Villa Agas are extremely helpful and are always there to help with any queries. Also, the best way to travel round Santorini is by renting an ATV which you can rent directly next door. It is owned by a family friend (Magicmoto), they are definitely the cheapest rental company out there and the owners are fantastic. If you haven't rode on an ATV before, it's not hard and definitely worth it as buses are very irregular and are always late!