I stayed at Marcias apartment for 2 months, during which I was at Porto for work, so I really got to know this apartment. The apartment looks just like in the pictures which is pretty amazing, although it is a bit smaller than expected. The location is very central, 5 mins walking from Bolhao station and approx 10 mins walking from Trindade station. A metro goes straight from the airport to Bolhao station, so in that sense the location is optimal :) One thing I was very happy about was the weekly cleaning which is included in the rent if you stay for more than one week. Natalia, who helped with the cleaning, left the apartment spotless, which made it even better to enjoy my time here.
There are two things that were not optimal: 1) a dog lives in the apartment below. This dog will start barking early mornings at 7 am or on the weekends at 1 am -2 am at random ( my guess is that he starts when his owner goes out). The dog is very loud and will bark for a looong time. So if you are sensitive to loud noises or want to make sure that your sleep isn't interrupted you might want to bring some ear plugs. (This is something out of Marcias control so the info is really just to let you know that ear plugs will be beneficial and is not meant as criticism to Marcia or the apartment.)
2) The apartment is advertised for up to 4 people and indeed there are 4 sleeping places available ( 2 in a double bed, 2 on a sleeping couch in the living room), nevertheless I think it is too small for four people, especially considering that to go to the restroom you have to enter the room where the bed is. I stayed at Marcias apartment alone most of the time. My boyfriend visited once and that was still fine. For me, anything more than two people would have been too many in an apartment with that size and layout.
In total, I can say that I really enjoyed my time here and will come back if I'm ever in Porto again for work