I booked Maria's place at the last minute after I arrived at Porto airport.
I was very lucky, Maris responded me right away, and from then on, she always kept communication with me, I feel very safe in Portugal alone, I really felt I had a friend.
Maria's place is much more than I expected, it is very clean and well organized, she comes here everyday to make sure everything is ok, and she always ask me if there is anything I need...she really goes out of her way to help me.
It takes about 30 minutes to Proto city center by metro, Uber is about 17 Euro.
Maria's home is so calm and comfortable, you might want to just relax at her home after walking up and down in the crowds.
Remember to try the chicken from Pingo Duce supermarket, and salad with tomatoes. :))