Pleasant apartament, had everything we needed for our stay. It was clean and ready for us. We were 3 but if can accomodate up to 4 people (2 sleeping on the couch) it has 2 bathrooms and big enough for 4.
It's on the ground floor, which makes it quite handy when travelling with lots of luggage, however, it can be a bit noisy by night.
It's located in the centre of Porto, with public transport near by, restaurants, and supermarkets. We mostly walked everywhere.
Overall we have enjoyed our stay.