We had a comfortable stay at this lovely apartment with great views ofrom the park and the circle of Marques de Pombal. It is a quiet neighborhood at walking distance or about 5 euros by taxi from the central pedestrian zone of Lisbon. It can house 4 people comfortably.
A word of caution would be that the smaller bedroom+bathroom are rather compact although the larger ones are spacious. You also have to adjust to the hot water flow - if it turns cold, just stop the flow for a couple of seconds and it will run hotel again. These are negligibly minor inconveniences.
I totally recommend the apartment.