Sílvia's apartment was incredible. It is located in an area that's close to everything, as well as the most beautiful metro and train station I've ever seen (in case you want to go farther than you feel like walking). Sílvia was excellent with communication before and during the stay, and the apartment is fully stocked with everything I could even think to need in my four days in Porto. Also, it's so modern, clean, and well-appointed! It's exactly as depicted in the listing, and is ideal for a few people traveling together. There are cafés right downstairs, as well as several others nearby. In addition to all this, it's very secure (the door to the main entrance is thick and windowless, and is locked by a keypad) and I felt incredibly safe as a female traveling alone.
Absolutely perfect stay.