We had a very enjoyable stay at Helena's place. We were met at the property where she was very welcoming and gave us all the useful information that we needed... Where to get groceries, where to eat, WiFi pass code etc...
The location is perfect to explore Porto with the metro about a minutes walk away. We tended to walk to to the city centre which took around 15 mins or less with lots of shops and cafes on route.
I would definitely recommend this place particularly if you are on a tight budget. It was fantastic value and we were very please with the experience we had.