A great base for exploring Porto! You're right in the city center and everything is walking distance. The apartment is close to where some bars are, so some nights (weekends) might get a little loud but Gisela provides earplugs if you need them. (I didn't find the noise to be a problem though!)
Gisela was kind enough to set up an airport transfer for me, to and from the airport, which was very convenient especially for when leaving Porto as I had an early morning flight. She had some good recommendations for the city and the apartment was perfect!