I stayed at Graciela in Gradac for a week with my family, and totally recommend this place!!
The flat description was accurate, it was simple but spacious, clean and equipped, parking, balcony. The area is very safe and we loved Gradac and Croatia. The beach is just downstairs and Gradac was gorgeous as well as full of restaurants and small shops. The owner and her family were very friendly!! The owner speaks English.
The flat is on the top floor (no lift).
The address was a little hard to find