We had a great stay at Silvias apartment. It is a nice little spot near the city center. You can reach everything in walking distance. It is also near the Trindade station from where you can take the metro for example to the airport or Matosinhos. The apartment has everything we needed for our 2 days city trip. The communication with Silvia was always very fast, friendly and helpful. She did everything, so that we felt very welcome at her apartment. :)
P.S.: The pasteis the nata from the bakery downstairs are the best! ;)