The apartment is very well located. Right in the city center of Porto, near to every touristic spot. Perfect to visit the city by foot.
The apartment is actually a studio well furnished with everything you need to spend a nice short stay.
Other comments mentionned the fact the apartment is located in a small street pretty quiet. That's true but be aware that the isolation inside the building isn't really good. So if you're not lucky (just like us) we'll have some trouble to sleep at night.