Look no further, perfect for staying a couple of days in Porto, very central location, main spots (Torre dos Clérigos, Avenida dos Aliados, Sé, Ribeira, ...) can be reached by walking 5-10 minutes, also, if driving you will be able to park the car in "Parque de estacionamento Alfândega" where there's an option of buying a 72 hours ticket for 20€. Apartment itself is also very good.
Finally, Natércia's pro-activity when it comes to help and providing hints about the city, a great host, a really kind person.
I felt at home and looking forward to return, I'll surely reach out to her in first place.
All the best Natércia!