Really good place to stay!
We visited Porto like 2 weeks ago and chose this apartment because of its location and its modern look. It was absolutely worthy, because the apartment is really cozy (with many facilities) and well located (near the centrum, sights, metro station, supermarket...)
I have to say that Carolina and Luis were really really helpfull and kind to us.
They were also flexible with our check-in and check-out and always tried to find a solution to make our stay even more comfortable.
Just one "negative" thing that should be mentioned is the noise from the street - probably caused of the construction of the nearby building.
Anyway, we were very satisfied!