The apartment was one of our favorite airbnbs in recent memory. Mafalda kindly met us in person at the apt for check in, which was especially helpful because the apartment does not quite match the pin location for the address on google maps. But her instructions of going to the restaurant right next to the apartment helped us locate it.
The Rossio location of the apt is extremely convenient to all of downtown Lisbon. I did not feel the need to take a train or taxi anywhere except for Belem. We were able to walk to basically every other major landmark.
The apt itself is very spacious, larger than we expected. It is spotlessly clean. The bed is comfortable (not too soft) and the shower pressure is excellent. One flight up the stairs. It is located above a street with several restaurants/bars, so do not expect complete silence at night— some street noise will definitely be audible from the apartment. We were able to sleep without any problem at all, but we are not light sleepers so YMMV.
Overall would highly recommend!! My only complaint is not being able to stay longer.