The apartment is located in one of the best places to experiment Porto: Near the riverside and the downtown area. However, please keep in mind this is also a place with a lot of homeless people and drug users (but still safe!), so would not advise for a family trip just for the visual shock. For young people however, it's one of the best spots.
The apartment is spacious, the furniture is nice and comfy and the beds gave us a very good night of sleep.