We had a great stay in Efi's beach house in Tinos. Its location is terrific, right on the beach (50m, no road to cross).
The sandy beach is very nice, with shallow, children-friendly crystal-clear waters, with a few sunbeds and umbrellas, and very quiet. There are also two nice restaurants close-by, walking distance, if you don't want to cook, but we had great dinners in our pleasant terasse.
All in all, good value for money and great location.