We stayed in the apartment over the weekend and we loved it. The location is just perfect! All necessities are available and the tips Miguel gave us upon arrival were really good, even though I think I know Porto quiet well ;-)
The only thing you should know before hand is that Plano B (lovely club) closes around 7 am. During that time it gets noisy on the street.
If you have no problem with that, this Airbnb is your perfect Porto City Center accommodation.