Marcia's apartment was very nice, about 10 minutes walk downhill to Belem with plenty of places to eat and drink and some sights. From there it was easy to hop on the tram or bus into Lisbon (about 15 - 20 minutes).
The apartment is probably better suited to a couple rather than a family of 4. We found it a bit small and lacking in amenities. There was only one wardrobe - in the main bedroom - with about 5 hangers in. There was only one mirror - in the twin bedroom. We found that we were all sharing things a bit. The kitchen did not have a kettle or a washing machine and although large the lounge was rather overtaken by 3 massive pot plants meaning there was only room for a small corner sofa which only sat 3 of us.
Marcia is a lovely host and I'd fully recommend booking her tuktuk tour of Belem and Lisbon.
All in all we did enjoy our stay but probably should have booked something slightly bigger with more amenitiesto suit our needs.