We loved the apartment - very clean and beautifully decorated. It is small but still manages to feel spacious and there is space to sit out on the balcony. The kitchen is fully equipped and easy to cook in.
The apartment is surrounded by nice bars and restaurants and it is not far to walk down to the river. It's also easy to get to from the airport.
Because the apartment is in a lively area, there were occasionally loud groups of people walking past late at night; however the apartment has double glazing so the noise didn't really bother us.
Maria was extremely welcoming and met us early to check in and let us store our bags for the day after we checked out as we had a late flight.
We would definitely stay here again if we came back to Porto.