We are looking at apartments as the most viable alternative in Barcelona for 5 day/4 night stay for a family of 6.

Found this apartment for 6, 4 nights @843 euros
Aragón - Rambla Cataluya Deluxe apartment
http://www.rent4days.com/

I will highly appreciate your feedback on this renting company as well as any other you know that I may consider.

Thanks