When I booked through AirBnB, I wasn't sure about which apartment I would be getting after seeing the reviews. When we arrived, we weren't disappointed (we were told we had been upgraded) but I can imagine this can be an issue for others who may have particular requirements.
When we booked, we paid the amount they asked for but then had to pay a tourist fee, which works out at about 2.5 per day per person. This, in my opinion, wasn't clear and was a little disappointing. The person who showed us around was nice and happy to help.
The area of Poblenou is very nice with lots of local restaurants and close to the beach and Metro. I recommend going to the ones with menus in Catalan (not English) as they are much cheaper! Boccalino is lovely for breakfast and tortilla.
In the apartment, the bed had a comfortable mattress and there was a nice sofa good enough to sleep on. There is a washing machine/drier and heating/air con. In the kitchen there was a coffee machine (nespresso with 2 tabs) and enough utensils, pots and pans to make food from scratch from the markets around (but we did have lots of essentials leftover). In our flat there were two rooms and two bathrooms, so we had one each! There were towels and gel, champoo and conditioner. The balcony was lovely to have dinner out in and had sliding panels for privacy.