The apartment is a short walk from the Arroios metro station, which provides rapid and inexpensive transit into the main tourist areas. As a group of five, we found the accommodation comfortable and convenient, but I think it would feel crowded with maximum occupancy.
Communication and check-in were smooth and efficient, thank-you PT Keys.
Lisbon is a delightful city, well worth a visit, and would recommend to others. Of course, the fabulous weather helped.