The little extra hallway noise from people coming in and out at the ends of the day is more than made up for by the convenient location and comfortable amenities of these short-term apartments.
Not quite as attractive as the photos make them out to be, but not bad at all. No view to speak of, but you're not in Lisbon for the view from your hotel. You're there for the many interesting things to do. Doing them is easy from here.
Just off Marques de Pombal and access to bus service and the blue and yellow metro lines, with an excellent local restaurant across the street, a park with another great restaurant to your north, and the wonderful walk to the ocean on the Avenida de Liberdade to your south, you should be very happy.
Comfortable bed, free internet, satellite TV, full kitchen (though no oven), washing machine, and plenty of closet and cupboard space.
Two caveats: if you bring a third person, be prepared that the separation between sleeping and living areas is not solid walls and doors; and bring a bowl sanitizer, just in case they haven't installed one - the standing water in the toilet can be just a tad dicey.
I never heard the neighbors until they left their rooms, so unless you need the quiet of a coffin around the clock, or absolute luxury appointments, this is an excellent value for the money.
Enjoy!