I have stay 6 days (but have paid 7) in this hotel last year (2005) in July.
This is indead a beautiful country house in the Alentejo. The pool was also beautiful.
The bedroom was comfortable, and well decorated.
But that is all for the positive side.
They have their own observatory, but it was unavailable during the all stay.
The São Domingos in house restaurant is not a plus point. It is in fact beautifully designed. But does not offer, in my opinion, the quality service that it was supose to. There is not much choice (they offer a fish named "corvina" all the time or you can always ask for a steak with too much salt in it). I am not a gourmet, but i think the food was not well prepared. The price was to much high for the quality of the food and the service. In fact, my wife and I get sik with it and went home one day earlier.
There isn 't any activity to do. The hotel do not receive any newspaper. The called "biblioteca" does not exist. And the next town (mertola) is 17 km far away,
There is no Mountain bikes or jeeps are available to guests for excursions.
I do not recommend this place to anyone! Stay away from this place. Portugal has so much more to offer... but not in this hotel.