Mar has a nice apartment very close to the beach. It was fine to stay a couple of days. We did lots of walking to explore around Barcelona.
Mar was really helpful and communicative especially when I didn't understand the checking in app (still not sure how it works) but she made sure I could get in.
The apartment is clean and respectable. The only thing is the area does not have much going on. It's quite industrial so if you are looking for a place with lots of atmosphere, this isn't it. But it's a very short walk down to the beach and if you like walking, you can explore around Barcelona. I had a great time!