Maria's Apartment was very nice, clean and comfortable. We had a nice time staying there, the best part is the outside table for meals and the small terrace were you can see the sunrise. We had wifi, air conditioning and plenty of towels.
The position is nice but we strongly recommend to rent a car, you can use the buses but the schedule is not clear and has many problems in communication, the only upside is the price. If you want to go to another place that may be near to the apartment you have to take the bus to Fira and then come back to the destination.
Near the apartment there was a black sand beach with plenty of free space and also bars and restaurants.
There's also a couple of mini markets of which we were informed in the very useful manual that Maria left in the apartment.
We strongly recommend to stay in Maria's apartment but we also recommend to rent a car to move from and to the apartment.