Incredibly flexible and helpful hosts, wonderful communication, quick replies and, most importantly, they were willing to discuss all questions and requests and adjust to my needs - really very very helpful! The apartment is nice, but I didn't spend much time there: it's the central location that mattered to me, as I stayed in Barcelona for work for 10 days. And the fact that the beds were very comfortable, which is not always a given when you travel, so you get to sleep well :) The terrace is of course a brilliant addition for a morning coffee or an evening glass of wine! The only thing is that you can hear noises from the staircase, including the lift going up and down, so I slept with earplugs (which I don't mind at all, but some people may).
Again, big thanks to Luna and Xavi for being such wonderful, kind and well-meaning hosts!