We (a British family of 4) really enjoyed our stay at Mathieu/Sabrina's apartment. The accommodation is both attractive/stylish and comfortable at the same time, and it provided everything that we needed.
Communication with our hosts was very easy and they were really helpful and prompt in all our correspondence in advance of and during our stay.
This was our first visit to the City, and we were not therefore too sure of the best places to stay, however, for us the location of this apartment was perfect. Immediately outside the building were great places to eat; a Metro station is just around the corner, and Placa Catalunya/the head of La Rambla is only a short walk away.
We would thoroughly recommend this accommodation to anyone.