Went to this restaurant with a group of work colleagues with a reservation for lunch time (at around noon). Going to this restaurant without reservation is not recommended. We were 11 people and we all asked for the same dish, "Picanha". The person that organized this lunch vouched for the quality of this dish, and I must say she we was not wrong. The dish is very simple and the side dishes as well (French fries and rice) but it was delicious. At the end we did not ask for any dessert since the quantity of the main meal was more than enough. The price per person was average, at around 12,70eur. Based in this experience I can recommend this place. Just as a disclaimer, do not expect the waiters to be friendly, they are not.
My absolute favourite in the Oeiras region. Try their choco frito salad, and the ameijas (see their photo!). Suck in its garlic sauce with their hot freshly baked bread. Absolutely delicious (and I highly recommend the red Urra wine!). Hurray!!