Barbara's apartment is wonderful. It is located on the fourth floor (eith elevator) of a lovely building in Gracia. About three minutes' walk from the metro, even less for some useful buses right on the street. Most central sites are within a 15-20 minute walk or a short metro ride, but the neighborhood is residential and the apartment is extremely quiet. Also tons of places to eat and drink nearby, and a couple of good supermarkets within two minutes' walk.
The apartment is beautifully designed, sparkling clean and has everything you might need, including dozens of small helpful touches. Living room, fully equipped kitchen, two bedrooms all perfect; bathroom is large and spotless and there's a separate room with a toilet. There's excellent air conditioning, a washer and dryer if you need them, and even a dishwasher.
Barbara met us when we arrived and gave us a lot of useful information, and there are also many guides and maps in the apartment. Communication was great throughout our stay and Barbara was quick to help with anything we needed.
Overall this is a great place, very highly recommended.