We spent a few days in this lovely apartment in Lisbon as a family of 5 with kids aged 8, 10 and 13. The apartment is very well located just next to the Dom Pedro IV square. It is large enough for a family of five even if we had dinner only once in the apartment.
The terrace offers very enjoyable views of Lisbon's rooftops. It must be very hot in summer but it was very enjoyable when we visited in late October. Our arrival was very well organized.
You need to be aware that the apartment is on the 4th floor (actually more like 5th) with no elevator. It was not a problem for us to climb there every day, but hauling a large suitcase up the stairs was a bit painful. Also it is better if you are not too tall because with my 183 cm, I did hit the kitchen door frame on a couple of occasions and it does hurt. Finally, we found the quality of mattresses to be just OK, my wife and I had to stretch a bit in the morning to warm up our backs.
But altogether, this was a very enjoyable stay and I would recommend Isabel's apartment.