Great location, beautiful flat exactly as described in all the pictures.
Clara is a very pleasant host answering all your questions prompt.
Flat is very clean and very comfortable including all things you will need for a few days.
Yes, as you can read in some other ratings the flat is a little noisy, directly on the Av.Diagonal, even with closed windows, but thats Barcelona - a city with a lot of car traffic.
A bigger issue for me was that the Wifi did not a lot of times.
All aspects considered we can really recommend the flat. Metro, supermarkets, bakery, restaurants - all you need is very close.
Looking out of the window you can see Sagrada. Mostly we went by foot directly to the centre or the Port Olimpic.
Had a great time - thank you Clara&Christina