My husband and I, my sister and her husband stayed in Rosa and Nicolas' apartment for 4 days. We have stayed in many airbnb apartments before but Rosa and Nicolas are the most organised, efficient, friendly and competent hosts yet. On arrival, we were met and made to feel welcome, provided with all possible information re local sights, supermarkets, where to eat - in short everything to make for a fantastic stay. We were asked to sign a rental agreement detailing conditions and listing the value of all equipment/utensils in the apartment - given the quality of the furniture and fittings, we didn't find this unreasonable.
The apartment was spotless and exceptionally well equipped. It has one large bedroom with a huge ensuite, a second small bedroom and a third smaller bedroom which both share a very small bathroom. The terrace is a good size, captures the sun in the afternoon and is a very pleasant spot to relax and enjoy a glass of wine after a day's sightseeing. The kitchen is functional and includes a dishwasher and washing machine.
The apartment is located on the 7th floor (elevator in the building) in the Eixample neighbourhood - a 5 minute brisk walk to the nearest subway, a large supermarket just around the block, a 15 minute walk from an exceptionally good area for tapas restaurants.
In short, we had a great stay and would not hesitate to recommend both the apartment and Rosa and Nicolas.