Thank you for nice staying in Porto. I really loved locality, restaurants above, balcony, the view from balcony, clean service and easy self checkin, Wi-Fi, equipement of the flat.
What I would really change is the bed - it was very uncomfortable and every move was noisy.
It would be also very nice to fix several broken things as opening of windows.
And the last thing - noise from the street. I know, it is not the host´s fault - but it would be nice for exemple to offer earplugs or to make better isolation :-)