Marie's place is a great base to discover Lisbon. We really enjoyed the central location - we could walk everywhere during the day and have romantic dinners nearby in the evenings. The apartment is located at the 4th floor so if you're not ready to climb some stairs, then maybe it's not the best fit for you. However, the 4th floor is the furthest (highest) you can get from the noise below (the whole area is full of outside restaurants and outside bars which are open long into the night), so in our opinion it was a plus.
It does get much more quiet after closing the window, but at the same time it gets hotter in the room. There's a fan to use, but it produces a certain level of noise, too.
The bed is comfortable and the apartment is sparkling clean every day. Marie is a lovely person. We appreciated that she arranged the check-in meeting at the nearby landmark, from where she led us to the house. This way we definitely avoided getting lost.