Our stay at Grambella was very enjoyable. It's a bit hard to find (particularly arriving at night) but if you follow the instructions provided there should not be a problem.
The panorama views from the three! terraces are unbeatable. Our breakfasts with view on the Mediterranean are already missed. There are no houses in view for a few hundred meters, so you really have some privacy here.
There is no real double bed but only two single beds moved together.
Location wise we loved the place, it's very conveniently located 2 mins from the main road and Rethymno is just a 10 min drive. Exploring the western part of Crete from here was all very much in reach.
All in all, very recommendable!