Astra is simply perfect for a relaxing break in the hot Greek sun. Friendly staff, very chilled-out place, all buildings and decor in excellent conditions, the gardens are fantastic. Super pool, lots of sun beds, even in August we always got lots of pool-side time. The sea and a little beach called Ammes is literally 250 metres from Astra, so it's perfect for an afternoon dip. Restaurant is decent enough but probably the only weak link, especially as there's not that many restaurants nearby either.
The only watch-out....if you don't like aeroplanes landing/taking off, then this isn't the place for you! It's very close to the runway, but the planes only land a few times a day, and even then they're actually quite a cool spectacle.