I rented Laia and Aleu's apartment for a week over Christmas when my mature-aged parents were visiting, and found it exquisitely suitable - it has a great sunny lounge/dining room and good central heating, very quiet bedrooms (oriented away from the street) and a lift to get you to the third floor in comfort. The kitchen and bathroom are small (not untypical for Barcelona) but functional (though the shower had a way of subjecting you to a bit of Kneipp therapy - but i guess that's probably good for you). The neighbourhood (Gracia) is among Barcelona's most interesting, with a fantastic village feel and an undeniable hipster presence. Everything you will ever need is in pleasant walking distance - for everything else there's a metro station literally within fifty steps of the front door. I only met Laia for check-in and check-out procedures, which went very smoothly. Highly recommended!