The apartment is better than you could imagine from the photos and all the other great reviews are absolutely correct.
I stayed there for 5 weeks whilst working in Barcelona and it was an amazing location, really quiet, very easy to walk everywhere, close to great markets, great parks, great restaurants and wow the view and terrace....... If you can stay here then I would absolutely recommend it but yes it is on the 6th floor and youdo get a great work out after all that amazing food!
The communication with Anna could not have been better and I felt entirely welcome and comfortable in her great apartment.