This apartment is absolutely great! Very closed to the center. You can find everything you might need in the area: restaurants, bar, market and more. Is very closed to the metro station and to the shopping area. It basically has everything you might need.
We stayed in Middle July and the climate is just perfect. The house has the air conditioner but it was fresh at night so you just sleep great! The house has also two balconies where you can relax and chill out!
BEST PART: Alvaro & Helena sent us a guide of Porto which allowed us to visit the best places and experience the Portuguese culture with the local tips ;)
Ps. Make sure you follow their instruction for direction because Google Maps will miss the civic number (at least this is what happened to me :) ).