We really enjoyed our stay in Paulo's place. The location is very central. There is ease of access to Rossio station, the Avenida, as well as Principe Real. The waterfront area is only a short walk. We were able to walk everywhere we went in town and never needed to use the Metro, though the Restaudores station is close.
There are a number of complaints on prior reviews about the check in process--this really could not have been easier. Paulo has made it essentially foolproof by providing links to the necessary apps as well as videos that explain how to use the apps in order to access the apartment. The fact that my phone could let me into the apartment was a huge plus for us.
The space itself was beautiful and the pictures are very accurate. The living room/kitchen area is very spacious and the furniture is comfortable. The kitchen has all modern amenities if necessary (we really only used the refrigerator). The bedrooms are in the back of the unit, on a garden area that is very quiet. There is a door that will separate the living room from the bedroom area, making the back of the unit essentially silent at night time--which can be a difficult feature to find in a large city like Lisbon. The windows are new and do a good job of noise cancelling--though we left them open frequently for the nice breeze. There are air conditioning units in every room that are strong and work well.
This is a great find and I would recommend staying there!