The apartment is neatly located in a pedestrian only street, so there is no main street noise which is very nice. A lot of hip cafés and restaurants are around it and we almost walked everywhere as the apartment is right in the middle between the hotspot areas (but plan with some time to get to places). To Belém it was about two hours to walk and to Alfama through the Bairro Alto about an hour or a little more. But as all the streets and houses and the street art are awesome to look at, you don't really notice how much you are walking.
The apartment was a little smaller than we expected from the photos, but most houses in Lisbon seem very small, so I guess that's just normal. Everything was tidy and the kitchen well equipped. Cooking is no problem as there are windows on both sides - so getting the "smelly" air out, is no problem.
And I loved the communication with Shannon, always one step ahead of us. Can very much recommend staying at the apartment.