We really enjoyed our stay in this apartment. It's really well located and easily accessible on the metro from the airport. Antonio met us there, and gave us heaps of information about Porto, as well as some great tips about places to eat and what to see and do.
The apartment itself is really nice, very clean, nice decor, good size for 2/3 people and has a well-equipped kitchen if you're cooking for yourselves rather than eating out.
I wouldn't hesitate to recommend this apartment, i'm sure you like it as much as we did.