Franceline's flat is very spacious and could easily house four people at a time. Unfortunately there is only one wine glass and one coffee mug, which could be a problem.
We struggled a bit with communication before our stay as we never got confirmation messages when we discussed the time we would arrive, and when we got to the flat at the time we told her we would be there (which was almost two hours after the normal check in time on her listing) she was still busy cleaning the flat and we were only able to put down our bags and had to leave immediately again. She also didn't tell us what time she would be done.
She showed us a nice route on a map that we could follow using the bicycles that are in the flat. It was a lovely idea and we had a lot of fun! We would definitely recommend using the bicycles in the flat if you have time.
The wifi was also not working when we got there (the Wednesday) and she said that she'll be back on Friday with someone who will fix it. The wifi then worked for about an hour that we were home the Friday afternoon but was off again by the evening. We believe that this was out of her control, but would just like to mention it as well.
We had a very pleasant stay in Porto. The flat is about 25min walk from the tourist area and be prepared for all of the hills! But what a beautiful town!