Barbara's place is very nice and comfortable. It is located in a great area: close to the centre and all amenities, but very quiet at the same time. We barely used public transports because almost everything was at a walking distance. There are many shops, bakeries and very good restaurants/taverns in the neighbourhood, and also many bars and nice places to have a drink.
Barbara is a great host and easy to communicate with, she also gave us many tips for visiting the city. We really enjoyed Porto, the city is superb and the people are very welcoming.
I would absolutely recommend you to visit Porto and stay in Barbara's place.