The apartment was great - exactly what we were looking for. It's a small, old, but very charming flat in a building that you might have seen on some postcards from Porto - perfectly located in the city center that you can reach everything by foot. It's right in front of the railway station where Mario picked us up.
We only had to do with Mario, but he was a great host. He always responded very quickly, ready to help anytime and really cared that we have a comfortable stay. He was very friendly, punctual and easy-going.
The flat was clean, well equipped and looks really like in the pictures.
I absolutely can recommend this place to stay. I hope that this flat is available the next time we go back to Porto - we really loved it.