We stayed 4 nights in this very clean and quiet apartment. We enjoyed the comfortable furniture, nice beds and well equipped kitchen. The Wi-Fi worked fine and the television had lots of channels. Unfortunately it rained a lot, so we had to use the heater and it worked fine. Outside area looked ver nice too.
This apartment is a bit out of the centre, on a hill. We bought the Andante Tour Card (Porto's public transport card, available at the airport and larger metro stations) and used it a lot. It gives unlimited use of the metro, buses, and some regional trains to get around the city. We mainly walked into town (downhill) and took the bus or metro home.
We enjoyed our time in Porto.