Sorry that your friends have not enjoyed as I wanted in my apartment.
There may be noise at certain times because the bedroom faces the street, but the apartment is considered very quiet compared many who are in the city center. Barcelona is a very noisy city.
I apologize for the stain on the quilt and is solved. Possibly a former client made and the person who cleans could not fix it, (for lack of time or because there were no spare blanket at the time).
Deep cleaning is one of my most important slogans and I try to do so. Unfortunately, sometimes, always a mistake is made.
As for the bed that is in the passage (as shown in photos) it is really a double bed. I did not say anything to your friends because they were a couple with a child and felt that they did not need the second bed.
I also try to keep very competitive prices compared to products offered in Barcelona, a city that is greatly increasing taxes because of the great tourist success and am aware that I can not raise prices because of competition also: My apartment is not in the center, and I should give an added value.
In short, I repeat, I'm sorry they have not enjoyed as much guest deserve on holiday. And finally, I really appreciate the feedback to improve and I suggest you report any problems during the stay to help in any way I can.