Seeki.eu lists 20,000+ properties for sale and 2,000+ to rent in Barcelonès.
The median asking price is €310,000, or €4,107 per m² on a typical 74 m², across sale listings that publish both a price and a floor area.
On the rental side, the median asking rent for an apartment is €2,000 a month, across apartment rentals that publish both a price and a floor area.