My family & I (we were 5 adults) stayed at Anna's place for 3 nights and had a great time there. She gave us very good instructions for self check-in, and provided most of the things we needed for a 3 night stay. She even left a bottle of wine and biscuits for us which was a nice touch. The place had an electric stove, a microwave, & dishwasher. There was also a washer/dryer, which was a bonus since other places we stayed at in Portugal usually had a washer but no dryer.
Many of the sights in Porto like the Dos Clerigos Church, Sao Bento station, the entrance to the upper level of Ponte Luis I bridge, and Cais da Ribeira were close by. I definitely recommend Anna's place for a wonderful and comfortable stay in Porto.