We had a nice stay at Vasco’s place. The apartment’s location is great, nearby the city center and in walking distance of all the main sightings in Porto.
Like Vasco already said in the description, it is an old building, so you indeed have some noise from outside and it can get quite warm inside. However, this didn’t bother us at all, we slept great and there is a mobile A/C available to cool down the place a bit if you want to.
In short: we would recommend to stay here when in Porto. It is great value for your money.