Positiv: the location of the flat is very good. you can reach La Rambla or the St. Josep La Boqueria in 10 min. The beach is 30 min away by walking which I find cool. Due to the flexibility of the host we could take our room 1 hour earlier.
Negativ: when we arrived our room was a little bit dirty. There is only one little cupboard in the room which was dusty. The towels were very old that is why after you used it once they became smelly.
The walls are pretty thin. Our room was next to the bathroom so at the first night we could hear all the process when one of the guests vomitted in the bathroom.
The other night another guest took a girl in his room (I`m pretty sure she wasn't paid for the room because this was the only night she spent there). They were talking all night and after that 18+... due to the thin walls we could hear everything and we couldn't sleep.
However, it's not the responsibility of the host that the walls are pretty thin, I just wanted to let others know.