Site visited just recently, March 2020. As it was already fully described by others I will add just one thing that was not underlined. Whoever visited that place prior 2011 had no chance to view the site by any means as the whole place looked completely different. By viewing google maps I found this: Google maps image

That is a view of Valongo Wharf as it looked in 2010. If the link is not working, try to place Pegman (this yellow man on Google maps) on the small unnamed road, just where the lettering of Praca Jornal do Comercio is located on the map. Instead of remnants of Valongo Wharfs you can see a street and parking place, all asphalted. Just imagine that 1-2 meters below the the surface there are ruins what is now called Valongo Wharf