We spent a total of six nights at the apartment and our family of four (kids aged 4 and 7) were very pleased with the experience and we happily recommend it. We met Carlos and he is very pleasant to deal with. He speaks mostly Portuguese but we had no issues communicating.
The description of the listing is accurate.
1.It is a beautifully, bright and classy restored apartment in a restored older building fronting on a quiet street (probably on-street parking, with valuables removed)
2.The kitchen is well equipped (stove, fridge, microwave, coffee maker, toaster, IKEA dishware, etc…)
3.There is cable television, a DVD player with many movies, and Wifi
4.One queen-size bed in the master bedroom and a set of sturdy bunk beds (fine for kids, okay for adults) in the other. Lots of closet space. Towels and sheets provided.
5.Nice new bathroom with large walk-in shower
6.The “Intendente” Metro stop is 5min away (we were glad we bought multi-day unlimited transit passes at the airport)
7.Easy to reach the apartment from the airport via the Red and then Blue subway lines (it took about 2 hours from touchdown to reach the apartment)
8.Supermarket store 3min walk and a number of Asian supermarkets nearby
9.If you enjoy walking, it’s a mere 15-20min walk to the heart of Lisbon or you can take the subway or tram a few stops. Taxis are really cheap, anyways.
To note:
1.There didn’t appear to be air conditioning which might be a slight issue in extreme heat season, although since the master bedroom and living room face the street and the kitchen and junior bedroom face the inner courtyard, you can get a cross-breeze by opening the windows at both ends of the apartment.
2.The apartment is two floors above ground level and up a slightly narrow stair case. Not a problem for us but perhaps a consideration for others.
3.Yes, it sleeps four but one person has to then use the top bunk of the bunk bed. Our kids liked it.
4.The area where the apartment is located is mainly residential. There are colourful characters throughout the city, including this neighbourhood. We felt safe, although use your usual travel smarts.

We highly recommend the Aquarium and Science Centre, both at the World Expo Site. There is also a large shopping centre at that location.