We had a nice 4 day stay at Palacio de Sant'Anna! The room is exactly like on the pictures. The Palacio is kind of a a students residency for international students so there are bunch of students around and they all have been friendly and helpful!
The toilets, showers and cooking places are shared between everybody in the house.
It's about 5-10 minutes by food from Rossio so it's located very centrally and an awesome place to discover the beautiful city.