Javier is an excellent host. From the start his communication with us was excellent. All of the information provided was really helpful and he went out of his way to answer our additional questions.
The apartment was as described, very clean and had everything we needed. We have a young baby and a highchair and cot were provided. There is no bath but there is a huge kitchen sink which we used for baby's bath time!
The neighbourhood is lovely. It is reasonably quiet but supermarkets, shops and restaurants are just a short walk away. It also felt very safe and friendly. There is easy access to the city centre and all of Barcelona's sights via metro. As the name suggests, the apartment is near the beach too.
There are a couple of things we should mention, neither of which adversely affected our stay but are worth noting. As Javier mentions in his listing, the elevator in the building is old and small. We could squeeze in with a reasonably big stroller though. Also, noise from the neighbours does travel in the building so it is possible to hear voices or TVs in the evening (but not late into the night) . The neighbours are not particularly noisy though and this didn't affect us.
Overall we would definitely recommend Javier's apartment.