This is an excellent apartment! It's a few blocks from the metro, which is very easy to use in Lisbon and about 7 minutes into the heart of the tourist section and the same to the airport. The tourist area in Lisbon is very crowded (for Baixa Chiado) and very hilly (for Alfama), so it's nice to have a small measure of distance from it in the evening and it truly is a short distance.
The apartment is spotless, with everything you need. The terrace is glorious!
If you're doing this apartment with 4 people, it might be a bit crowded (I assume the couch is a sofabed, but I don't know for sure), but the terrace can really act like a living room, so if you're okay with opening and closing the sofabed for the other 2 people, you would be fine. Communication was perfect.