The apartment was very lovely, it had everything we needed and was perfect for a three people group, but it's absolutely fine for four people. Unfortunately Katya was out of town so we were supposed to meet with her associate, who showed up an hour late! Luckily there was a nice bar right at the corner of the building. Same story on our check out, 45 minutes late...
Anyways, we had a great time staying in the apartment, high quality kitchen, clean & pretty central, which makes it easy to just go on a walk around Barcelona, and if you like walking, we do, it's just a 20-30 minute walk to the beach.
I would definitely rent this apartment again.