I strongly recommend Adriana's place.
Our bedroom and bathroom were very nice and clean.
The house is strategically located right outside the metro station, so we could easily reach the city centre in 20 mins. Moreover we could reach the airport in 15 mins on foot as we had a very early flight in the morning.
If we happen to visit Porto again, we will definitely return to Adriana's place.
Thank you!
Serena & Marco