Really nice apartment and team looking after you. It's a great location (on Gaudi Avenue, in sight of the Sagarada). We had a great time in Barcelona and this place was part of that.
However we did have a few issues, firstly the bedroom windows are single glazed and we found it to be a bit chilly (it was March) even with the heating turned up, and quite noisy. Being a Londonder noise is not normally and issue but it did bother us both here.
I also found the bed rather uncomfortable but that is personal choice and my girlfriend said it was OK.
The main issue however, was being surprised with another contract when I arrived. I've used Airbnb a few times before and never had to sign anything else upon arriving at the flat. The reason for this is that the place is rented by a company not an individual host. So overall things were less personal than most Airbnb experiences I've had and whilst that may be cool for some people, I do like the more personal touches from hosts.
In all, I would stay here again but my preference would be to find another place.