We (2 adults and 2 kids) stayed at Damien's apt for 3 nights in July 2017. Overall, it was a very good experience. The apartment is located very close to metro stops and you can walk down to la sagrada familia and passeig de gracia. There are a lot of nice bars and restaurants located very close by. The place is clean & modern and the host was very helpful with tips and suggestions. There is only one A/C in the apt but it was enough to cool the whole apt so we never had any issue.
Overall - a nice place. I'd use it if I'm in Barcelona again.