Our stay at Lola's apartment was marvellous. There were 8 of us, but the apartment fit us comfortably, even down to the large glass dining table.
Lola is an attentive host who replied to my messages before my stay (this was my first airbnb) quickly and effectively in English. The apartment's location seems to be quite central (las ramblas is about a block away, I walked to the Sagrada Familia in 25 minutes).
The costs are very up front and reasonable, with the only additional charge being a 0.75¢ city tax per person per night, which is advertised in the listing. The lack of additions was extremely helpful when booking with such a large group.
Thanks for the stay, Lola - we hope we are welcome again!