We stayed at Elis' place for five nights and had the best time. On arrival, she gave us a very thorough introduction to the amenities and things to do in Porto and the area. The apartment was very clean, spacious and had everything we needed. The kitchen was good for cooking and there was coffee as well as tea that we could prepare every day. Elis' place is located 2 minutes from a great food market with affordable options and even great opportunities for port wine tastings :) City center is walking distance 20-25 minutes away, or you can take a bus nearby. Would definitely recommend this place and hopefully will return one day.