This apartment is perfectly located for exploring Porto. It's located just outside the super-tourist river area, but within an easy walking distance of all the port houses, sights, etc. It was just a short stroll to some of the best restaurants and bars, and for a longer stay conveniently had a supermarket right next door. There was a cafe and a tasty breakfast restaurant right downstairs as well, it was easy to pop out for a morning coffee and be back in the apartment 15 minutes later.
(A note for light sleepers - the apartment is on a busy street with a large recycling deposit across the street, so there are garbage trucks every morning. We were able to sleep fine with the shutters closed and the white noise app on my phone.)
The apartment itself is very pretty and quite spacious for a studio, although there were some little details that could have made our stay better (no hangers for clothes, nothing but hand soap in the bathroom, the air conditioner makes a weird buzzing sound every minute or so.) The key code locks can be a bit tricky to operate, but once we got the hang of them they were really convenient. The kitchen was well stocked with pots, pans, cutlery, etc and it was easy to prepare meals, but you'll need to buy your own cooking oil, spices, etc - my guess is this is a pandemic-related change, and with the supermarket right next door it wasn't really a problem.
Maria was amazing with communication - we had an issue with the washer/dryer not working and she was very communicative, updating us on when it would be repaired and even letting us use one of the other empty apartments to wash our clothes. We had ended up being stuck in Porto for five extra days due to a Covid exposure and Maria helped make an otherwise stressful situation a little better.
Definitely a great little spot for those looking to explore Porto but perhaps not be right smack-dab in the middle of the most touristy part of town.