We were a group of 12 (7 adults and 5 kids) and overall we had a great stay. Location is the best in Lisbon, the apartment has great renovated bathrooms and sleeping arrangements were roomy and comfortable.
The reason this is not a five star review is because there were a few minor issues:
(1) The apartment is on the 3rd floor so lots of stairs.
(2) The common areas, particularly the living room, was small for our group size.
(3) There is no central heating and the use of the provided heaters caused the electric circuit to overpower and disarm.
(4) The water heater is pretty finicky so we needed to coordinate baths and we would get an occasional cold shower