If you are looking for an apartment, I don't think you'll find a better place to stay than this in Lisbon.
The location is great, window looks at the back of the parliament and the prime minister lives nearby, so it's very safe. The position is also great, a lot of tram and bus lines from the nearby Estrela square to the west, north/north-west of the park and a major R. de Sao Bento street that goes in parallel to the east. We even walked one day from the very center of the city (Commerce Square), it took us 40 mins.
The apartment itself is very nice, cozy and clean. Great shower and kitchen (not that we used it much except for the fridge and the coffee we made every morning). The building is also cool, from the 1920-ies. The best of all was the Elisabete's welcome feast, which really meant a lot for us when we arrived late in the evening, tired and hungry. She was also very kind during our stay and provided us with many tips and answers to the questions we had about Lisbon).
My wife and I wholeheartedly recommend this place to everyone.