Apartment has a great location in central location: surroundings are peaceful even during Lisbon fiesta season in June. Just couple of blocks away it was a lot of noise during night but not at in this area. Rooftop terrace was wonderful to enjoy breakfast or a small relaxing bite during the afternoon. If you prefer having breakfast outside in a cafe, there's plenty of options nearby. Doris gave a list of recommendations and other helpful information.
Size of the apartment is perfect for a couple. Extra plus for bathroom/shower: water pressure is very good! Did not wash any clothes but there is also a washing machine in the apartment.
There is no elevator but this is normal in an old traditional building.
This part of Lisbon is great for travelers who enjoy walking. Please keep in mind that there is a lot of hills so better bring those flat heels with you :)