Hi Waxwings,
For Serra de São Mamede I suggest the following sites:
Marvão Castle and walls for Crag Martin, Black Redstart, Rock Bunting, Blue Rock Thrush - 39.395409, -7.378309
Galegos cliffs for Griffon Vulture, Crag Martin, Blue Rock Thrush and Alpine Swift - 39.356123, -7.313748
Porto da Espada chestnut groves for Woodlark, Rock Sparrow, Spotless Starling and Cirl Bunting - 39.353543, -7.357575
Beirã railway station for White Stork and Pallid Swift - 39.449835, -7.368176
Barragem da Póvoa (a reservoir) and its surrounds for Bee-eater, Hoopoe, Subalpine, Sardinian and Spectacled warblers, Crag Martin, Red-rumped Swallow, Azure-winged Magpie, Woodchat Shrike, Golden Oriole and Spanish Sparrow - from 39.452254, -7.533958 to 39.478535, -7.551886
Hope this helps!
Gonçalo