My stay in Carolina's apartment was very good. The flat is really nice and quite spacious. I believe it would be perfect for two.
Carolina and her husband were nice and friendly. They provided me with all the necessary information and gave great recommendations on the things to do in Barcelona.
The location is outstanding. The Picasso Museum is almost around the corner and the metro station is just across the street. It is about 10-15 minutes to Plaça de Catalunya and to the quay.