My wife and I stayed at Cinta's flat with two friends (another couple) and absolutely loved the space and found that it was a great location for getting around the city. We would definitely stay at this spot again when visiting Barcelona. Cinta and her son, Mike, were very easy to communicate with and check-in/check-out.
One note for other travelers - this flat does not have two queen beds. There are two twin beds pushed together in both rooms. While we were a bit bummed about this - since it was a deciding factor when looking at a few other spots - we did still love the space and think it is a really stylish/well set up apartment and was really fun to hang out in, etc. Just thought this was worth calling out in case it matters to others