Palácio Sant'Anna is a charming, clean and comfortable residence in a quiet area at the very heart of Lisbon. It is a perfect departure point to explore the city and its surroundings (sights, bus/train/metro stations are within walking distance, connections are very good). It gives you all the privacy (can get noisy at times, though - depending on other people staying there at the same time), the staff is welcoming and responsive. Definitely recommend, as the price is appealing, too!