The apartment is located in a nice area, close to the famous Sagrada Familia, but right next to the building there is Recinte Modernista de Sant Pau which is also an amazing and must-have place to visit. There is a direct bus to Nova Icària beach and a metro station also close by.
The check-in process was very smooth, and the communication went well. The apartment was extremely clean.
The only upsetting about this apartment was the sound insulation and size. It looks like there is two rooms separated with big wooden door which have solid floor across two apartments. As a result, whenever someone was walking in the next apartment, it sounded like someone was walking next to you. And you can hear everything your neighbours do or say. But that was not even the biggest annoyance: there was an Italian restaurant which was playing loud music for half of the night. Extremely loud.
The apartment is also not that big. I think it's most comfortable for two people; for three, it's okayish and if 4 - I think that will be challenging.
Overall if you do not mind potential noise, I recommend this apartment.