This is a very convenient spot, short walking distance (5-7 minutes) from the popular tourist spots and transportion such as Livraria Lello, Clerigos tower and the Sao Bento metro station. The Campagna train station is about 10-12 minutes by taxi.
Couple of nice restaurants, both high end and authentic Portuguese as well as coffee shops in the area, all within 5 minutes walking distance. With the University of Porto buildings nearby, chance to see some fun activity by students and faculty.
If you are looking to do some shopping, the Rua Catarina shopping area is about 12-15 minutes walking distance.
All in all, a very convenient and spacious apartment for a couple. The concierge of the property, Tatiana Teixeira was a pleasure to work with. Quick to respond to your questions and needs.