Honestly I was afraid when I read the previous comments. But when I get there to pick the car, the staff was nice and friendly. Of course he tried to sell me more options (toll, fuel...) but it is part of their job after all.
I took a video of the car and pictures in order not to have bad surprise when I will give it back in Porto. So let's see after the return of the car if I will have a bad surprise as other customers had (extra costs...).