We did a lot of mistake during our reservation, including the date!!! Marta and her brother were just amazing of kindness and of patience. They fix up all our mistake.
The flat is located just in the center of Poblenou near of everything you need.
Poblenou is not the very touristic center of Barcelona. Indeed, you feel there like in a small spanish (or catalan) seaside village but in 10 minutes with the metro or even by bike (along the sea) you are on the famous rambla in barcelona center.
Just perfect. I can only recommend this location.