Stayed at Maria's place for 5 days and it was an excellent experience! The place itself is a simple room but with cute modern touches combined with Cycladic home feel. Bed was comfortable and the place has everything you would need (except for an iron, which would be nice but not a dealbreaker). Water heater and pressure are also good. Other reviews said that you can walk to cafes and restaurants from this place but I always drove anyway so I'd say this location is ideal for roaming around Santorini. Maria also responds pretty quickly to inquiries which is important for a host to do.
If you are on a budget, this place will not disappoint!