We (5 ladies) had a wonderful stay at Ligia's apartment. The apartment is located in a quiet street, but restaurants, bar, shops and the river are very nearby. Actually... everything a tourist would want is within walking distance. I would say it is the perfect location!
The apartment itself is clean and comfortable and has all the necessary facilities. I would suggest to place an extra couch or sofas (for groups larger than 3 people) though, but that's just a minor suggestion. Porto has lots to offer, so why stay in right?!
Ligia is very hospitable and the communication with her was very adequate. She also arranged two taxi's for us from and to the airport and the drivers we're two very kind gentlemen as well. Overall, we had a very pleasant experience with Porto, Ligia and the apartment, so we would definitely recommend to stay at her place when visiting Porto.