My wife and I spent almost three months in Sarah's apartment and it was amazing. Keep in mind that this was during the pandemic (I write this in the past tense, hoping my optimism pays off), so our stay was slightly different. We spent a lot more time in the apartment than we usually would, but that was okay, as it felt like home.
The apartment is spacious with a small terrace. There was some construction being done nearby, but the double windows did a great job of blocking out the noise and the neighborhood is quiet at night. Everything you need for a long or short stay. And Sarah is one of the nicest people we met in Porto. And that's saying something, as everyone was very friendly.
I couldn't recommend her apartment more highly and we hope to come back to Porto again in the future.