We (a couple) stayed here mid August for 4 nights. We enjoyed our stay at Porto very much.

Location
The apartment is locationwize very convenient. Nearby is a metrostation that will get you throughout the city and to the airport. Name of the station = Sao Bento. Next to this metrostation is the trainstation, both are a 4 minute walk from the apartment. Furthermore you can walk to every part of the city: you’re close to the bar/restaurant area and also not far away from the sightseeing spots. It is easy to get to the apartment, however the street it is in is the most steep street we’ve seen in whole Porto. Be aware that it is a small climb. Therefore we would not recommend this place to elder people or families with small kids.

Apartment
The apartment itself was small but fine size for us. It was clean and met just our needs. With the suitcases inside there was not to much space to walk around, but it didn’t bother us too much. The bed was very comfy, so was the shower. The owner was kind and willing to help, for instance he gave some recommendations for restaurants.

Best
The location was probably the best for us. Also the fact that it was clean and newly renovated was nice.

Worst
The climb to and inside the apartment was our least favorite thing here. The apartment was in a very steep street and inside we we're sleeping on the third floor. What made it all better was that Mario was willing to help with the suitcases.

Recommendation
We would recommend this place if you are looking for a great apartment in the city center of Porto, if only you don't mind climbing a steep street. But whole of Porto is one big hill anyways ;).

Thank you Mario for your apartment and hospitality!