Lluís was very friendly and helpful, he sent us the timetables for the train going from the airport. Unfortunately, we couldn't meet in person but we were in contact during our stay in Barcelona. He is a really caring host.
There was a surprising thing related to the apartment though. On the pictures I didn't see that there is no natural sunlight in the apartment as the window in the bedroom has a view to the staircase of the house and therefore, it was quite noisy in the mornings. (the bedroom is basically in the basement). The other 2 windows overlooked to an inner channel.
The apartment was well-equipped. Overall, it was good.