Had a lovely 4 night stay at Rosa's place. The apartment has a great location....close to all the sightseeing, public transit, shopping and restaurants. Still offers silence and peace at night time for a good rest, and safe and secure!
Rosa is an awesome host and her family is very helpful for any tips.
This is a 2nd floor walk up so if you have heavy luggage or mobility issues plan accordingly. Also the street itself is a bit of a hike (as most of Porto is like San Francisco), so take an Uber if you don't like a climb.
My only feedback on improvement would be about the shower...I'm a small guy, but it was still very tiny. Also not having a holder for toiletries was inconvenient.
Would definitely stay here again if I visited Porto! Much better value and a better experience than the hotel chains.