This is a great beautiful place and is near perfect. It is sparkling clean, spacious, has a sunny terrace and a big dining table in the living room if you fancy a meal at home. If you travel in a group of 4, like we did, please note that the living room is a walk-through room with little privacy, so whoever sleeps in the bedroom will walk through the living room in order to get out of the flat, or into the kitchen and the terrace. The living room has a bottom of the range ikea sofabed (Lyksele i think) that was a cause of some discomfort for us. The bedroom bed was good.
There are 2 bathrooms (one of which is en-suite) so that was very handy.
The location is very good and we walked to the Cathedral and everywhere within central Porto. There is a 2 bedroom flat next door that is owned by the same couple so a larger group can be accommodated conveniently if booking together. All in all the flat comes highly recommended.