Our experience with Sonia was fantastic. She is very nice and actually flexible about the time of check in/out. The flat is very nice, clean and spacious. The 3 bathroom are a plus for a group of 7 as we were.
The flat is in the city center 100 m from Metro Station Campo 24 De Agosto, and 10 min from Sé by foot, so you can reach most of the cultural monuments of Porto quite easy. Sonia also stayed with us to suggest places to see, restaurant and activities and this has been much appreciated.
I recommend absolutely this flat and I hope to meet Sonia again!