My friend and I stayed at Anders’ place for four days, the flat was nice and well situated with the metro station in front of the building and few minutes walk far from Montjuïc. We enjoyed the terrace as well even though it was a bit cold it is still nice to sit there to relax.
The only thing is that the flat is not very well isolated and you can hear the neighbours. There is a room close to the entrance and if you sleep there you might here everything happening in the corridor. It didn’t really disturb us but it depends of people I guess.
I would still recommend Anders’ place to visit Barcelona for few days.