I stayed at this place for three nights. The apartment was clean. Even though it is located quite close to the city center, it was quiet thanks to the windows facing the courtyard.
The host was also very helpful and accommodating.
There are many things and places to see in the surrounding area. The only minus worth noting is the presence of small garden ants. Perhaps this is a common thing for an old house in Porto, but this fact surprised me a little.
I definitely recommend the apartment for couples looking for a quiet place to stay while discovering beautiful Porto.