Great place and location - Rambla del Poblenou is just around the corner!
The flat is relatively small but it is expected from the pictures.
There is an additional Barcelona tax payment upon arrival which is collected at the check-in. Furthermore, once the online booking with airbnb is finalised, an additional registration, which takes you outside of airbnb, is expected from the host. It did not create any additional issues but was slightly odd.
Otherwise, wonderful communication and nice Barcelona suggestions from the hosts.