We stayed at Mar's for 5 days and we loved it. We were 4 people and there was enough room for all of us. The location is great, with easy access to metro, a few mins walk from Sagrada or San Pau; the apartment is also quiet as the windows are facing an interior courtyard and not the street. Mar was lovely - I haven't met her in person but we whatsapped each other quite a bit. Would definitely recommend!