I stayed at Célia's place overnight for what was basically an extended layover in Porto. She picked me up from the airport and was very helpful and pleasant to talk to. She even provided me with a small breakfast for the next morning.
The facilities were great and would have been comfortable for more than a single night. It was a 20 minute walk (probably, I had to run) to the airport.
I'd very highly recommend this airbnb and would stay here again if the opportunity came up.