Our family of 5 (3 kids between 9 and 12) really enjoyed this property. The property is bright and airy and pretty quiet, even though it is on a relatively busy street. It is full of charm, with an old wooden staircase (not good if you have mobility issues as the apartment is on the 1st floor, and it is a longer than typical flight of stairs), high ceilings, wooden shutters, and lovely old tiles on the walls. We did not make use of the kitchen, so we can't speak to that part of things, but there was plenty of room for us and the location was great. There are also AC units for when the weather gets hot, although we did not need to make use of them in February.
The location is great. Quick walk down to the TimeOut Market and several restaurants or up the hill to a little square with good bakeries (pastel de nata!) and several restaurants in the immediate area. Down the hill to catch the bus or tram to Belem or the Oceanarium. Easy walk over to Baixa and Alfama.
We did do A LOT of walking with lots of hills, so be prepared for that as you explore Lisbon!