We visited 'Salto del Cabalho' in july for only one week with our two kids (14 and 11). The old but very nice renovated house is something special with a very nice atmosphere, the small pool is nice and refreshing, the garden end terraces offer enough space for evryone. If there is anything you need, just ask the very nice and helpful owner Eva.
There is a very large natural and a normal swimming pool in Portagem, 8 km. Visiting the village and Castle of Marvao (on a mountaintop) is something you wouldn't miss, as well as horse-back riding at 'Caballos de Marvao' or renting a mountain bike at the reception of the swimming pool in Portagem. Ride to the lake at the Barrgem (dam) nearby (look at the map) and swim in clear and fresh water. (cheap) diners at Valencia or Castelo de Vide. Don't expect Disco's, French cuisine or night-life, everything even in the mid-season very quiet and easy. But even the Kids loved it. A week is just to short ..we hope to come back.