We spent 3 nights in this apartment and it was perfect for our needs. The location is great - it's a quiet area and down a steep hill you are in the middle of the city. If the hill is a problem then you can pay 3.70 euro for a return trip on the funicular. The apartment was clean and exactly as shown with a big kitchen and a lovely courtyard. There are also restaurants and a grocery store within walking distance.
The stand out though is the service provided. Lourenco picked us up from the airport and drove us past some sites before taking us to the apartment and explaining everything. He also booked us a taxi to the train station for our onward journey, and was available for any questions or concerns.
We enjoyed our stay and would definitely recommend this apartment for a visit in Lisbon!