It's a very nice flat and very suitable for a group from 3-6 guests. It's only a short walk through the beautiful streets of Porto to the Metro station that will take you to the city centre in about 10 minutes. On the other hand it's only 20 minutes to the airport, making this location perfect for visitors from abroad. A very good WiFi connection is available and it's generally very well equipped.
The appartement is in a quiet part of the city not far away from the centre, giving you the possibility to get an impression of the "real" Porto outside of the touristic hotspots.