There is a total accordance between what was written in the description: no bad surprise.
Helena/Artur are fully dedicated to the well-being of their hosts and it was very appreciated! Tks to them for their availability and their smile.
I want to go back again in Porto!
Detailed comments:

The flat is very well located, as you're not totally in the down-town, but few minutes by walk was good opportunity to discover all the small streets of Porto.
The roof is very pleasant, unfortunately, the sun orientation isn't helpful to take advantage of the sun.
In the living-room/kitchen: one thing could be improved! More light!
At the 1st floor, 1 room with a double bed, 1 room with one double bed and one simple bed (+1 simple bed hidden, but I wonder where we can installed it).
The bathroom is clean, but quite small, even it's sufficient. One major point to be improved: the totally capacity of the "water balloon" seems to be for 8 people (as the flat allow 8 people for a journey), but we were 6, and the last one who has taken the shower didn't have hot water (brrrrr).
Finally, I recommend this place to stay in Porto!!!
Tks again for the wonderfull welcoming Helena & Artur provide to us!