We spent 5 nights at Maria's apartment. It is in the perfect location, many of the sights we wanted to see in Lisbon are within walking distance. It is very close to the Baixa-Chiado metro station for trips further afield.
The apartment itself is very well organized and equipped. There are 5 large windows in the living area and 2 in the bedroom so there is plenty of natural light. There is a large closet / dressing room with many drawers and space for hanging clothes, as well as storing luggage. We didn't come close to using all the space when we were there. The bathroom is large and fully equipped, again with a lot of storage space.
The kitchen has everything you need to prepare full meals, including all of the utensils and pots and pans. There was nothing we needed that we couldn't find.
Rita met us when we arrived and showed us around the apartment and gave us information on the neighborhood. Everything was very professionally done. She also responded immediately whenever we contacted her, and arranged a taxi to the airport for us the morning we left.
Be aware that there is no elevator in the building and the apartment is on the third floor. That may be an issue for persons with mobility issues, although for everyone else it helps work off the pastel de natas. The only other point to mention is the apartment isn't air conditioned, which might be an issue in the hottest summer months, although it didn't trouble us at the end of May.
We had a great stay, and would definitely return if we ever come back to Lisbon.