Stayed for a week.with our 3 teenage daughters. Really great location, lovely spacious apartment in a quiet street. Brilliant mini market a 5min walk away that stocks everything you need to self cater if you want to. Kitchen has basic equipment.
Ricardo was very helpful arranging airport transfers and checking we had everything we needed after we had arrived. We weren't blessed with great weather, it was cool enough (15 deg) to need to use the little heaters placed in most rooms. Not sure they would be sufficient to heat the apartment if it got really cold, and they did keep tripping the fuse box.
Lisbon is a beautiful city with lots to see and do and the apartment is well placed to reach it all. It's pretty hilly though, and the cobbled pavements lethal when damp.
Would definitely recommend to families as a city break base.